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Transcript of Contents by Subject Area xiii Contributors xvii Guide to the Encyclopedia xxiii Foreword xxv Preface...
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Encyclopedia of
INSECTS
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Amsterdam Boston London New York Oxford Paris San Diego San Francisco Singapore Sydney Tokyo
Encyclopedia of
INSECTS
Editors
VINCENT H. RESHUniversity of California, Berkeley
RING T. CARDUniversity of California, Riverside
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Cover Art: Monarch butterflies photographed at an overwintering site in centralMexico. Each fall, eastern North American monarchs migrate by the millions tothese high-altitude Oyamel fir forests. The weight of their dense aggregationscan even cause tree limbs to break away. (Photograph by George D. Lepp, aspecialist in images of the natural world.)
Frontispiece: An 18th century engraving by I. A. Covinus depicts the Biblicaldescription of the creation of insects. The image appears in Physique sacre, ouhistoire naturelle de la Bible, a massive eight-volume study by the prominentSwiss naturalist Johann Jacob Scheuchzer (16721737). The artist Covinushere combines an accurate rendering of various insect forms with an allegoricaltreatment of the Book of Genesis; this approach reflects the authorScheuchzers lifelong efforts to provide scientific evidence for the literal truthof the Bible. (Courtesy of the History of Science Collections, CornellUniversity Library.)
Letter Openers:R: Snakefly (Raphidioptera) photographed at Nanaimo (Vancouver Island),British Columbia, Canada. (Photograph Jay Patterson.)Y: Aedes aegypti, Uganda strain (a vector of yellow fever), bloodfeeding fromthe photographers hand. (Photograph by Leonard E. Munstermann.)Other letter opener images furnished by the authors. (See relevant articlefor credit.)
This book is printed on acid-free paper.
Copyright 2003, Elsevier Science (USA).
All Rights Reserved.No part of this publication may be reproduced or transmitted in any form or by anymeans, electronic or mechanical, including photocopy, recording, or any informationstorage and retrieval system, without permission in writing from the publisher.
Requests for permission to make copies of any part of the work should be mailed to:Permissions Department, Academic Press, 6277 Sea Harbor Drive, Orlando, Florida 32887-6777.
Academic PressAn imprint of Elsevier Science525 B Street, Suite 1900, San Diego, California 92101-4495, USAhttp://www.academicpress.com
Academic Press84 Theobalds Road, London WC1X 8RR, UK http://www.academicpress.com
Academic Press200 Wheeler Road, Burlington, Massachusetts 01803, USAhttp://www.academicpressbooks.com
Library of Congress Catalog Card Number: 2002106355
International Standard Book Number: 0-12-586990-8
PRINTED IN HONG KONG02 03 04 05 06 07 RDC 9 8 7 6 5 4 3 2 1
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v
Contents by Subject Area xiii
Contributors xvii
Guide to the Encyclopedia xxiii
Foreword xxv
Preface xxvii
Acarisee Mites; Ticks
Accessory Glands 1Diana E. Wheeler
Acoustic Behaviorsee Hearing
Aedes Mosquitosee Mosquitoes
Aestivation 3Sinzo Masaki
Africanized Beessee Neotropical African Bees
Agricultural Entomology 4Marcos Kogan and Ronald Prokopy
Alderflysee Megaloptera
Amber 9George Poinar Jr.
Anatomy: Head, Thorax,Abdomen, and Genitalia 12David H. Headrick and Gordon Gordh
Anopheles Mosquitosee Mosquitoes
Anoplurasee Phthiraptera
Antennae 26Catherine Loudon
Ants 29Nigel R. Franks
Aphids 32John T. Sorenson
Apis Species 37Eva Crane
Aposematic Coloration 39Mathieu Joron
Apterygota 45The Editors
Aquatic Habitats 45Richard W. Merritt and J. Bruce Wallace
Arachnidasee Scorpions; Spiders
Archaeognatha 57Helmut Sturm
Arthropoda and Related Groups 59James H. Thorp
Auchenorrhyncha 66Christopher H. Dietrich
Autohemorrhage 74The Editors
Autotomy 75The Editors
Beesee Apis Species
Beekeeping 76Eva Crane
Bee Products 82Eva Crane
Beeswax 84Eva Crane
Beetlesee Coleoptera
Biodiversity 85Nigel E. Stork
CONTENTS
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Biogenic Amines 91Arnd Baumann, Wolfgang Blenau,and Joachim Erber
Biogeographical Patterns 94Peter Zwick
Biological Control of Insect Pests 103R. G. Van Driesche and M. S. Hoddle
Bioluminescence 115James E. Lloyd and Erin C. Gentry
Biotechnology and Insects 120Bryony C. Bonning
Blattodea 123Donald G. Cochran
Bloodsee Circulatory System
Blood Sucking 127M. J. Lehane
Body Size 130Christer Bjrkman and Mats W. Pettersson
Boll Weevil 132R. Nelson Foster
Bombyx mori 133Satoshi Takeda
Book Lousesee Psocoptera
Borers 135Timothy D. Paine
Brain and Optic Lobes 137Nicholas J. Strausfeld
Bristletailsee Archaeognatha
Bubonic Plague 147Irwin W. Sherman
Bumblebeesee Hymenoptera
Butterflysee Lepidoptera
Caddisflysee Trichoptera
Caste 151Sean ODonnell
Caterpillars 154Frederick W. Stehr
Cat Fleas 156Nancy C. Hinkle and Michael K. Rust
Cave Insects 158Francis G. Howarth
Cell Culture 163Dwight E. Lynn
Chemical Defense 165Murray S. Blum
Chemoreception 169B. K. Mitchell
Chiggers and Other Disease-Causing Mites 174Larry G. Arlian
Chitin 179Ephraim Cohen
Chromosomes 180Graham C. Webb
Chrysalis 185Frederick W. Stehr
Cicadas 186Max S. Moulds
Circadian Rhythms 188Terry L. Page
Circulatory System 192Thomas A. Miller
Classificationsee Nomenclature and Classification
Cockroachsee Blattodea
Cocoon 197Frederick W. Stehr
Codling Moth 198Stephen C. Welter
Coevolution 199Douglas J. Futuyma
Cold/Heat Protection 204David L. Denlinger
Coleoptera 209James K. Liebherr and Joseph V. McHugh
Collection and Preservation 230Charles V. Covell, Jr.
Collembola 235Kenneth A. Christiansen and Peter Bellinger
Colonies 239Sean ODonnell
Colorado Potato Beetle 242George G. Kennedy
Coloration 244Helen Ghiradella
Commercial Products from Insects 251Michael E. Irwin and Gail E. Kampmeier
Conservation 260Tim R. New
Crickets 265Richard D. Alexander and Daniel Otte
Crypsis 269Paul M. Brakefield
Cultural Entomology 273James N. Hogue
Cuticle 281Svend O. Andersen
Daddy-Long-Legs 283Gonzalo Giribet
Damselflysee Odonata
Dance Language 284P. Kirk Visscher
vi Content s
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DDT 288Fumio Matsumura
Defensive Behavior 289Justin O. Schmidt
Dengue 295Thomas W. Scott
Dermaptera 297Susan M. Rankin and James O. Palmer
Development, Hormonal Control of 300Michael E. Adams
Diapause 305David L. Denlinger
Digestion 310Walter R. Terra
Digestive System 313Walter R. Terra and Cllia Ferreira
Diplura 323Robert T. Allen
Diptera 324Richard W. Merritt, Gregory W. Courtney, and Joe B. Keiper
Diversitysee Biodiversity
Division of Labor in Insect Societies 340Gene E. Robinson
Dobsonflysee Megaloptera
Dog Heartworm 343Edward G. Platzer
Dormancy 344Richard E. Lee, Jr.
Dragonflysee Odonata
Drosophila melanogaster 345Patrick M. OGrady
Dung Beetles 348James Ridsdill-Smith
Earwigsee Dermaptera
Ecdysissee Molting
Ecdysteroids 352Michael E. Adams
Eggs 355Diana E. Wheeler
Egg Coverings 356Diana E. Wheeler
Embiidina 358Edward S. Ross
Embryogenesis 359Lisa Nagy and Miodrag Grbic
Endangered Insects 364Scott Hoffman Black and Mace Vaughan
Endopterygota 369The Editors
Entomological Societies 369Alan I. Kaplan
Ephemeroptera 373John E. Brittain and Michel Sartori
Estivationsee Aestivation
Evolutionsee Phylogeny
Excretion 380Timothy J. Bradley
Exopterygota 387The Editors
Exoskeleton 387Svend O. Andersen
Extension Entomology 390Nancy C. Hinkle, Beverly Sparks, Linda J.Mason, and Karen M. Vail
Eyes and Vision 393Michael F. Land
Fat Body 407Ephraim Cohen
Feeding Behavior 409Reginald F. Chapman
Fire Ants 414Les Greenberg
Fleasee Siphonaptera
Flight 416Michael Dickinson and Robert Dudley
Flysee Diptera
Folk Beliefs and Superstitions 426James N. Hogue
Food, Insects as 431Gene R. DeFoliart
Forensic Entomology 437M. Lee Goff
Forest Habitats 442David L. Wood and Andrew J. Storer
Fossil Record 455David Grimaldi
Freshwater Habitatssee Aquatic Habitats
Fruit Flysee Drosophila melanogaster
Gallmaking and Insects 464Katherine N. Schick and Donald L. Dahlsten
Genetically Modified Plants 466David A. Andow
Genetic Engineering 471Peter W. Atkinson and David A. OBrochta
Content s vii
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Genetic Variation 478George K. Roderick
Grasshoppersee Orthoptera
Grassland Habitats 481Teja Tscharntke, Ingolf Steffan-Dewenter,Andreas Kruess, and Carsten Thies
Greenhouse Gases, GlobalWarming, and Insects 486Peter Stiling
Growth, Individual 489Martin B. Berg and Richard W. Merritt
Grylloblattodea 492D. C. F. Rentz
Gypsy Moth 493Joseph S. Elkinton
Hearing 498Jayne Yack and Ron Hoy
Hemipterasee Auchenorrhyncha; Prosorrhyncha;Sternorrhyncha
Hemolymph 505Michael R. Kanost
Heteropterasee Prosorrhyncha
Hibernation 508Richard E. Lee, Jr.
History of Entomology 509Edward H. Smith and Janet R. Smith
Homeostasis, Behavioral 519P. Kirk Visscher
Homopterasee Auchenorrhyncha; Sternorrhyncha
Honey 521Eva Crane
Honey Beesee Apis Species
Honeydew 523Thomas E. Mittler and Angela E. Douglas
Hornetsee Wasps
Host Seeking, by Parasitoids 526Ronald M. Weseloh
Host Seeking, for Plants 529Elizabeth A. Bernays
House Fly 532Gregory A. Dahlem
Hymenoptera 534Donald L. J. Quicke
Hypermetamorphosis 546John D. Pinto
Hyperparasitism 549Daniel J. Sullivan
Imaginal Discs 552Seth S. Blair
Immunology 555Nancy E. Beckage
Industrial Melanism 560Michael E. N. Majerus
Insecta, Overview 564Vincent H. Resh and Ring T. Card
Insecticides 566Fumio Matsumura
Insecticide and Acaricide Resistance 569Gregor J. Devine and Ian Denholm
Insectivorous Plants 577Lewis J. Feldman
Insectivorous Vertebrates 580The Editors
Insect Zoos 582Leslie Saul-Gershenz
Integrated Pest Management 589Ronald Prokopy and Marcos Kogan
Integument 595Svend O. Andersen
Introduced Insects 597Daniel Simberloff
Island Biogeography and Evolution 602George K. Roderick and Rosemary G. Gillespie
Isoptera 604Vernard R. Lewis
Japanese Beetle 609David W. Held and Daniel A. Potter
June Beetles 610Daniel A. Potter and David W. Held
Juvenile Hormones 611Michael E. Adams
Katydidsee Orthoptera
Killer Beessee Neotropical African Bees
Lacewingsee Neuroptera
Ladybugs 618Michael E. N. Majerus
viii Content s
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Larva 622Frederick W. Stehr
Learning 624Daniel R. Papaj
Legs 627Peter H. Adler
Lepidoptera 631Jerry A. Powell
Licesee Phthiraptera
Lice, Human 664Terri L. Meinking
Locusts 666Reginald F. Chapman
Magnetic Sense 670John Klotz and Rudolf Jander
Malaria 672William K. Reisen
Mallophagasee Phthiraptera
Mantodea 675Lawrence E. Hurd
Mantophasmatodea 677Klaus-Dieter Klass
Marine Insects 679Lanna Cheng
Mating Behaviors 682Darryl T. Gwynne
Mayflysee Ephemeroptera
Mechanoreception 689Andrew S. French and Pivi H. Torkkeli
Mecoptera 690George W. Byers
Medical Entomology 693John D. Edman
Medicine, Insects in 698Ronald A. Sherman
Megaloptera 700Norman H. Anderson
Metabolism 703S. Nelson Thompson and R. K. Suarez
Metamorphosis 707Frederick W. Stehr
Migration 708Hugh Dingle
Mimicry 714Mathieu Joron
Mites 726Barry M. OConnor
Molting 733Lynn M. Riddiford
Monarchs 739Lincoln P. Brower
Mosquitoes 743Bruce F. Eldridge
Mothsee Lepidoptera
Mouthparts 750Reginald F. Chapman
Movies, Insects in 756May R. Berenbaum and Richard J. Leskosky
Musca domesticasee House Fly
Muscle System 763Robert Josephson
Museums and Display Collections 768Gordon M. Nishida
Neosomy 775Frank J. Radovsky
Neotropical African Bees 776Orley R. Taylor
Nervous Systemsee Brain and Optic Lobes
Nest Building 778Robert L. Jeanne
Neuropeptides 782Miriam Altstein
Neuroptera 785Catherine A. Tauber, Maurice J. Tauber, andGilberto S. Albuquerque
Nomenclature and Classification,Principles of 798F. Christian Thompson
Nutrition 807S. Nelson Thompson and S. J. Simpson
Ocelli and Stemmata 814Frederick W. Stehr
Odonata 814K. J. Tennessen
Orientation 823Ring T. Card
Orthoptera 827D. C. F. Rentz and You Ning Su
Ovarioles 839Diana E. Wheeler
Oviposition Behavior 841Marc J. Klowden
Parasitoids 845Nick Mills
Parental Care 848Michelle Pellissier Scott
Content s ix
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Parthenogenesis 851Lawrence R. Kirkendall and Benjamin Normark
Pathogens of Insects 856Brian A. Federici
Phasmida 865Erich H. Tilgner
Pheromones 866Ring T. Card and Jocelyn G. Millar
Phoresy 873Marilyn A. Houck
Photography of Insects 875Mark W. Moffett
Phthiraptera 879Ronald A. Hellenthal and Roger D. Price
Phylogeny of Insects 882Peter S. Cranston and Penny J. Gullan
Physical Control of Insect Pests 898Charles Vincent and Bernard Panneton
Phytophagous Insects 902Elizabeth A. Bernays
Phytotoxemia 905Alexander H. Purcell
Plant Diseases and Insects 907Alexander H. Purcell
PlantInsect Interactions 912J. Mark Scriber
Plecoptera 915Kenneth W. Stewart
Pollination and Pollinators 919Gordon W. Frankie and Robbin W. Thorp
Pollution, Insect Response to 926David M. Rosenberg and Vincent H. Resh
Polyembryony 928Michael R. Strand
Population Ecology 933Joseph S. Elkinton
Praying Mantidsee Mantodea
Predation/Predatory Insects 944Ronald M. Weseloh
Prosorrhyncha 947Carl W. Schaefer
Protura 965Robert T. Allen
Psocoptera 966Edward L. Mockford
Pterygota 969The Editors
Puddling Behavior 969Scott R. Smedley
Pupa and Puparium 970Frederick W. Stehr
Queensee Caste
Raphidioptera 973Ulrike Aspck and Horst Aspck
Rearing of Insects 975Norman C. Leppla
Recruitment Communication 980James F. A. Traniello
Regulatory Entomology 988Robert V. Dowell
Reproduction, Female 991Diana E. Wheeler
Reproduction, Female: HormonalControl of 994Diana E. Wheeler
Reproduction, Male 997Marc J. Klowden
Reproduction, Male: HormonalControl of 999Marc J. Klowden
Research Tools, Insects as 1000Kipling W. Will
Respiratory System 1002Jon F. Harrison
River Blindness 1007Vincent H. Resh
Rostrum 1008Reginald F. Chapman
Royal Jelly 1009Eva Crane
Salivary Glands 1011Gregory P. Walker
Scale Insectsee Sternorrhyncha
Scales and Setae 1017Shaun L. Winterton
Scorpions 1020Stanley C. Williams
Segmentation 1025Nipam H. Patel
Sericulture 1027Satoshi Takeda
Sex Determination 1029Michael F. Antolin and Adam D. Henk
Sexual Selection 1032Kenneth Y. Kaneshiro
x Content s
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Silk Mothsee Bombyx mori
Silk Production 1038Catherine L. Craig
Silverfishsee Zygentoma
Siphonaptera 1040Michael W. Hastriter and Michael F. Whiting
Snakeflysee Raphidioptera
Sociality 1044James E. Zablotny
Soil Habitats 1053Patricia J. Vittum
Sound Productionsee Hearing
Spermatheca 1058Marc J. Klowden
Spermatophore 1059Marc J. Klowden
Spiders 1060Rosemary G. Gillespie and Joseph C. Spagna
Springtailsee Collembola
Stamps, Insects and 1073Charles V. Covell, Jr.
Sterile Insect Technique 1074Jorge Hendrichs and Alan Robinson
Sternorrhyncha 1079Penny J. Gullan and Jon H. Martin
Stoneflysee Plecoptera
Stored Products as Habitats 1089Rudy Plarre and Wendell E. Burkholder
Strepsiptera 1094Michael F. Whiting
Swimming, Lake Insects 1096Werner Nachtigall
Swimming, Stream Insects 1098Bernhard Statzner
Symbionts Aiding Digestion 1102Andreas Brune
Symbionts, Bacterial 1107Michael E. N. Majerus
Systematicssee Nomenclature and Classification
Tastesee Chemoreception
Taxonomysee Nomenclature and Classification
Teaching Resources 1113John H. Acorn and Felix A. H. Sperling
Temperature, Effects onDevelopment and Growth 1116Frantisek Sehnal, Oldrich Nedved, and Vladimir Kostl
Termitesee Isoptera
Terrestrial Insectssee Soil Habitats
Thermoregulation 1119Bernd Heinrich
Thripssee Thysanoptera
Thysanoptera 1127Laurence A. Mound
Thysanurasee Archaeognatha; Zygentoma
Ticks 1132Daniel E. Sonenshine
Touchsee Mechanoreception
Tracheal System 1142Jon F. Harrison
Trichoptera 1145John C. Morse
Tsetse Fly 1151Stephen G. A. Leak
Urban Habitats 1157Michael K. Rust
Venom 1160Justin O. Schmidt
Veterinary Entomology 1163Bradley A. Mullens
VibrationalCommunication 1167Andrej Cokl and Meta Virant-Doberlet
Visionsee Eyes and Vision
Vitellogenesis 1171William H. Telfer
Walking and Jumping 1174Roy E. Ritzmann and Sasha N. Zill
Walking Stickssee Phasmida
Content s xi
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Wasps 1179Justin O. Schmidt
Water and Ion Balance,Hormonal Control of 1183Thomas M. Clark
Weevilsee Boll Weevil
Wings 1186Robin J. Wootton
Wolbachia 1192Richard Stouthamer
Workersee Caste
Yellow Fever 1196Thomas P. Monath
Yellowjacketsee Wasps
Zoonoses, Arthropod-Borne 1198Robert S. Lane
Zoraptera 1201Michael S. Engel
Zygentoma 1203Helmut Sturm
Glossary 1207
Subject Index 1227
xii Content s
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xiii
ANATOMYAnatomy: Head, Thorax,
Abdomen, and GenitaliaAntennaeBrain and Optic LobesChitinColorationCuticleDigestive SystemExoskeletonEyes and VisionIntegumentLegsMouthpartsOcelli and StemmataPupa and PupariumRostrumSalivary GlandsScales and SetaeSegmentationTracheal SystemWings
PHYSIOLOGYAestivationAutohemorrhage
AutotomyBiogenic AminesBioluminescenceBiotechnology and InsectsBody SizeBrain and Optic LobesCell CultureChemical DefenseChemoreceptionChitinChromosomes Circadian RhythmsCirculatory SystemCold/Heat ProtectionCuticleDDTDevelopment, Hormonal
Control ofDiapauseDigestionDigestive SystemDormancyEcdysteroidsExcretionEyes and VisionFat BodyFlightGenetic EngineeringHearingHemolymph
HibernationHomeostasis, BehavioralHoneydewImaginal DiscsImmunologyInsecticidesJuvenile HormonesMagnetic SenseMechanoreceptionMetabolism MoltingMuscle SystemNeuropeptidesNutritionReproduction, FemaleReproduction, Female: Hormonal
Control ofReproduction, MaleReproduction, Male: Hormonal
Control ofRespiratory SystemSalivary GlandsSegmentationSex DeterminationSilk ProductionSymbionts Aiding DigestionThermoregulationTracheal SystemVitellogenesisWalking and Jumping
CONTENTS BYSUBJECT AREA
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Water and Ion Balance, HormonalControl of
BEHAVIORAposematic ColorationAutohemorrhageAutotomyBioluminescenceBlood SuckingBorersCasteChemical DefenseChemoreceptionCircadian RhythmsColoniesCrypsisDance LanguageDefensive BehaviorDivision of Labor in Insect SocietiesEyes and VisionFeeding BehaviorFlightHearingHibernationHost Seeking, by ParasitoidsHost Seeking, for PlantsLearningMagnetic SenseMating BehaviorsMechanoreceptionMigrationMimicryNest BuildingOrientationOviposition BehaviorParental CarePheromonesPhoresyPredation/Predatory InsectsPuddling BehaviorRecruitment CommunicationSex DeterminationSexual SelectionSociality Swimming, Lake Insects
Swimming, Stream InsectsThermoregulationVibrational CommunicationWalking and Jumping
EVOLUTIONAmberAposematic ColorationBiogeographical PatternsCoevolutionFossil RecordGenetic VariationIndustrial MelanismInsecticide and Acaricide
ResistanceIsland Biogeography and EvolutionMimicryNomenclature and Classification,
Principles ofPhylogeny of InsectsSexual SelectionSociality Wolbachia
REPRODUCTIONAccessory GlandsEgg CoveringsEggsEmbryogenesisMating BehaviorsOvariolesOviposition BehaviorParthenogenesisPolyembryonyReproduction, FemaleReproduction, Female: Hormonal
Control ofReproduction, MaleReproduction, Male: Hormonal
Control ofSpermathecaSpermatophoreVitellogenesis
DEVELOPMENT ANDMETAMORPHOSISBody SizeCaterpillarsChrysalisCocoonDevelopment, Hormonal
Control ofEcdysteroidsEgg CoveringsGrowth, IndividualHypermetamorphosisImaginal DiscsJuvenile HormonesLarvaMetamorphosisMoltingNeosomyRoyal JellyTemperature, Effects on
Development and Growth
MAJOR GROUPS ANDNOTABLE FORMSAntsAphidsApterygotaArchaeognathaArthropoda and Related GroupsAuchenorrhynchaBlattodeaBoll WeevilBombyx moriCat FleasCicadasCodling MothColeopteraCollembolaColorado Potato BeetleCrickets Daddy-Long-Legs DermapteraDiplura
xiv Content s by Subjec t Area
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Diptera Drosophila melanogasterDung BeetlesEmbiidina EndopterygotaEphemeroptera ExopterygotaFire AntsGrylloblattodea Gypsy MothHouse Fly HymenopteraInsecta, OverviewIsopteraJapanese BeetleJune BeetlesLadybugsLepidopteraLice, HumanLocustsMantodeaMantophasmatodeaMecoptera Megaloptera MitesMonarchsMosquitoesNeotropical African BeesNeuroptera Odonata Orthoptera Phasmida Phthiraptera PlecopteraProsorrhynchaProturaPsocopteraPterygotaRaphidiopteraScorpionsSiphonapteraSpidersSternorrhynchaStrepsipteraThysanopteraTicks Trichoptera
WaspsZorapteraZygentoma
INTERACTIONS WITHOTHER ORGANISMSAposematic ColorationBlood SuckingCat FleasChiggers and Other Disease-
Causing MitesDefensive BehaviorDog HeartwormFeeding BehaviorHost Seeking, by ParasitoidsHost Seeking, for PlantsHyperparasitismMimicryParasitoidsPathogens of InsectsPhoresyPhytophagous InsectsPredation/Predatory InsectsSymbionts Aiding DigestionSymbionts, BacterialVenomVeterinary EntomologyWolbachia
INTERACTIONS WITHHUMANSApis Species Bee ProductsBeekeepingBeeswaxBlood SuckingBombyx moriBubonic PlagueChiggers and Other Disease-
Causing MitesCommercial Products from InsectsCultural Entomology
DDTDengueExtension EntomologyFolk Beliefs and SuperstitionsFood, Insects asForensic EntomologyHoneyInsecticidesIntegrated Pest ManagementLice, Human MalariaMedical EntomologyMedicine, Insects inMosquitoesMuseums and Display CollectionsRegulatory EntomologyRiver BlindnessSilk ProductionTsetse FlyYellow FeverZoonoses, Arthropod-Borne
HABITATSAquatic HabitatsCave InsectsForest HabitatsGrassland HabitatsMarine InsectsSoil HabitatsStored Products as HabitatsUrban Habitats
ECOLOGYAgricultural EntomologyAposematic ColorationBiodiversityBiogeographical PatternsBiological Control of Insect PestsBorersCoevolutionConservationCrypsis
Content s by Subjec t Area xv
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DDTEndangered InsectsGallmaking and InsectsGenetic VariationGenetically Modified PlantsGreenhouse Gases, Global
Warming, and InsectsHoneydewHyperparasitismInsecticidesInsectivorous PlantsInsectivorous VertebratesIntegrated Pest ManagementIntroduced InsectsMigrationMimicryParasitoidsPathogens of InsectsPhoresyPhysical Control of Insect Pests
Phytophagous InsectsPhytotoxemiaPlant Diseases and InsectsPlantInsect InteractionsPollination and PollinatorsPollution, Insect Response toPopulation EcologyPredation/Predatory InsectsSwimming, Lake InsectsSwimming, Stream Insects
HISTORY ANDMETHODOLOGYAmberBiotechnology and InsectsCell CultureCollection and PreservationCultural Entomology
Entomological SocietiesFolk Beliefs and SuperstitionsForensic EntomologyGenetically Modified PlantsGenetic EngineeringHistory of EntomologyInsect ZoosMedical EntomologyMovies, Insects inMuseums and Display CollectionsNomenclature and Classification,
Principles ofPhotography of InsectsRearing of InsectsResearch Tools, Insects asSericultureStamps, Insects andSterile Insect TechniqueTeaching ResourcesVeterinary Entomology
xvi Content s by Subjec t Area
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xvii
JOHN H. ACORNUniversity of Alberta, CanadaTeaching Resources
MICHAEL E. ADAMSUniversity of California, RiversideDevelopment, Hormonal Control of Ecdysteroids Juvenile Hormones
PETER H. ADLERClemson UniversityLegs
GILBERTO S. ALBUQUERQUEUniversidade Estadual do Norte Fluminense,BrazilNeuroptera
RICHARD D. ALEXANDERUniversity of MichiganCrickets
ROBERT T. ALLENParis, ArkansasDiplura Protura
MIRIAM ALTSTEINAgricultural Research Organization, VolcaniCenter, IsraelNeuropeptides
SVEND O. ANDERSENCopenhagen University, DenmarkCuticle ExoskeletonIntegument
NORMAN H. ANDERSONOregon State UniversityMegaloptera
DAVID A. ANDOWUniversity of Minnesota, St. PaulGenetically Modified Plants
MICHAEL F. ANTOLINColorado State UniversitySex Determination
LARRY G. ARLIANWright State UniversityChiggers and Other Disease-Causing Mites
HORST ASPOCKUniversity of Vienna, AustriaRaphidioptera
ULRIKE ASPOCKNatural History Museum, Vienna, AustriaRaphidioptera
PETER W. ATKINSONUniversity of California, Riverside Genetic Engineering
ARND BAUMANN Forschungszentrum Jlich, GermanyBiogenic Amines
NANCY E. BECKAGEUniversity of California, RiversideImmunology
PETER BELLINGER
California State University, NorthridgeCollembola
MAY R. BERENBAUMUniversity of IllinoisMovies, Insects in
MARTIN B. BERGLoyola University ChicagoGrowth, Individual
ELIZABETH A. BERNAYSUniversity of ArizonaHost Seeking, for PlantsPhytophagous Insects
CHRISTER BJORKMANSwedish University of Agricultural Sciences Body Size
SCOTT HOFFMAN BLACKThe Xerces Society, Portland, OregonEndangered Insects
SETH S. BLAIRUniversity of Wisconsin, MadisonImaginal Discs
WOLFGANG BLENAUUniversitt Potsdam, GermanyBiogenic Amines
MURRAY S. BLUMUniversity of GeorgiaChemical Defense
BRYONY C. BONNINGIowa State UniversityBiotechnology and Insects
TIMOTHY J. BRADLEYUniversity of California, IrvineExcretion
PAUL M. BRAKEFIELDLeiden University, The NetherlandsCrypsis
JOHN E. BRITTAINUniversity of Oslo, NorwayEphemeroptera
LINCOLN P. BROWERSweet Briar CollegeMonarchs
ANDREAS BRUNEUniversitt Konstanz, GermanySymbionts Aiding Digestion
WENDELL E. BURKHOLDERUniversity of Wisconsin, MadisonStored Products as Habitats Deceased.
CONTRIBUTORS
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GEORGE W. BYERSUniversity of KansasMecoptera
RING T. CARDEUniversity of California, RiversideInsecta, OverviewOrientationPheromones
REGINALD F. CHAPMANUniversity of ArizonaFeeding BehaviorLocustsMouthpartsRostrum
LANNA CHENGScripps Institution of Oceanography, La JollaMarine Insects
KENNETH A. CHRISTIANSENGrinnell College, IowaCollembola
THOMAS M. CLARKIndiana University, South BendWater and Ion Balance, Hormonal Control of
DONALD G. COCHRANVirginia Polytechnic Institute and State UniversityBlattodea
EPHRAIM COHENThe Hebrew University of JerusalemChitinFat Body
ANDREJ COKLNational Institute of Biology, Ljubljana, SloveniaVibrational Communication
GREGORY W. COURTNEY Iowa State UniversityDiptera
CHARLES V. COVELL, JR.University of LouisvilleCollection and PreservationStamps, Insects and
CATHERINE L. CRAIGHarvard University/Tufts University Silk Production
EVA CRANEInternational Bee Research AssociationApis SpeciesBeekeepingBee ProductsBeeswaxHoneyRoyal Jelly
PETER S. CRANSTONUniversity of California, DavisPhylogeny of Insects
GREGORY A. DAHLEMNorthern Kentucky UniversityHouse Fly
DONALD L. DAHLSTENUniversity of California, BerkeleyGallmaking and Insects
GENE R. DEFOLIARTUniversity of Wisconsin, MadisonFood, Insects as
IAN DENHOLMRothamsted Research, United KingdomInsecticide and Acaricide Resistance
DAVID L. DENLINGEROhio State UniversityCold/Heat ProtectionDiapause
GREGOR J. DEVINERothamsted Research, United KingdomInsecticide and Acaricide Resistance
MICHAEL DICKINSONCalifornia Institute of TechnologyFlight
CHRISTOPHER H. DIETRICHIllinois Natural History SurveyAuchenorrhyncha
HUGH DINGLEUniversity of California, DavisMigration
ANGELA E. DOUGLASUniversity of York, United KingdomHoneydew
ROBERT V. DOWELLCalifornia Department of Food and AgricultureRegulatory Entomology
ROBERT DUDLEYUniversity of California, BerkeleyFlight
JOHN D. EDMANUniversity of California, Davis Medical Entomology
BRUCE F. ELDRIDGEUniversity of California, DavisMosquitoes
JOSEPH S. ELKINTONUniversity of MassachusettsGypsy MothPopulation Ecology
MICHAEL S. ENGELUniversity of KansasZoraptera
JOACHIM ERBERTechnische Universitt Berlin, GermanyBiogenic Amines
BRIAN A. FEDERICIUniversity of California, RiversidePathogens of Insects
LEWIS J. FELDMANUniversity of California, Berkeley Insectivorous Plants
CLELIA FERREIRAUniversity of So Paulo, BrazilDigestive System
R. NELSON FOSTERU.S. Department of AgricultureBoll Weevil
GORDON W. FRANKIEUniversity of California, BerkeleyPollination and Pollinators
NIGEL R. FRANKSUniversity of Bristol, United KingdomAnts
ANDREW S. FRENCHDalhousie University, CanadaMechanoreception
DOUGLAS J. FUTUYMAUniversity of MichiganCoevolution
ERIN C. GENTRYUniversity of FloridaBioluminescence
HELEN GHIRADELLAState University of New York, AlbanyColoration
ROSEMARY G. GILLESPIEUniversity of California, BerkeleyIsland Biogeography and EvolutionSpiders
GONZALO GIRIBETHarvard UniversityDaddy-Long-Legs
M. LEE GOFFChaminade University of Honolulu Forensic Entomology
GORDON GORDHU.S. Department of AgricultureAnatomy: Head, Thorax, Abdomen, and Genitalia
MIODRAG GRBICUniversity of Western Ontario, CanadaEmbryogenesis
LES GREENBERGUniversity of California, RiversideFire Ants
DAVID GRIMALDIAmerican Museum of Natural History, New York Fossil Record
PENNY J. GULLANUniversity of California, DavisPhylogeny of InsectsSternorrhyncha
DARRYL T. GWYNNEUniversity of Toronto, CanadaMating Behaviors
xviii Contributors
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JON F. HARRISONArizona State UniversityRespiratory SystemTracheal System
MICHAEL W. HASTRITERBrigham Young UniversitySiphonaptera
DAVID H. HEADRICKCalifornia Polytechnic State UniversityAnatomy: Head, Thorax, Abdomen, andGenitalia
BERND HEINRICHUniversity of VermontThermoregulation
DAVID W. HELDUniversity of KentuckyJapanese BeetleJune Beetles
RONALD A. HELLENTHALUniversity of Notre DamePhthiraptera
JORGE HENDRICHSFAO/IAE Division, Vienna, AustriaSterile Insect Technique
ADAM D. HENKColorado State UniversitySex Determination
NANCY C. HINKLEUniversity of GeorgiaCat FleasExtension Entomology
M. S. HODDLEUniversity of California, RiversideBiological Control of Insect Pests
JAMES N. HOGUECalifornia State University, NorthridgeCultural EntomologyFolk Beliefs and Superstitions
MARILYN A. HOUCKTexas Tech UniversityPhoresy
FRANCIS G. HOWARTHB. P. Bishop Museum, Honolulu, Hawaii Cave Insects
RON HOYCornell UniversityHearing
LAWRENCE E. HURDWashington and Lee UniversityMantodea
MICHAEL E. IRWINUniversity of IllinoisCommercial Products from Insects
RUDOLF JANDERUniversity of KansasMagnetic Sense
ROBERT L. JEANNEUniversity of Wisconsin, MadisonNest Building
MATHIEU JORONLeiden University, The NetherlandsAposematic ColorationMimicry
ROBERT JOSEPHSONUniversity of California, IrvineMuscle System
GAIL E. KAMPMEIERUniversity of IllinoisCommercial Products from Insects
KENNETH Y. KANESHIROUniversity of HawaiiSexual Selection
MICHAEL R. KANOSTKansas State UniversityHemolymph
ALAN I. KAPLANEast Bay Regional Park District, Berkeley,CaliforniaEntomological Societies
JOE B. KEIPERCleveland Museum of Natural HistoryDiptera
GEORGE G. KENNEDYNorth Carolina State UniversityColorado Potato Beetle
LAWRENCE R. KIRKENDALLUniversity of Bergen, NorwayParthenogenesis
KLAUS-DIETER KLASSZoological Museum, Dresden, GermanyMantophasmatodea
JOHN KLOTZUniversity of California, RiversideMagnetic Sense
MARC J. KLOWDENUniversity of IdahoOviposition BehaviorReproduction, MaleReproduction, Male: Hormonal Control ofSpermathecaSpermatophore
MARCOS KOGANOregon State UniversityAgricultural EntomologyIntegrated Pest Management
VLADIMIR KOSTALInstitute of Entomology, Academy of Sciences,Czech RepublicTemperature, Effects on Developmentand Growth
ANDREAS KRUESSUniversity of Gttingen, GermanyGrassland Habitats
MICHAEL F. LANDUniversity of Sussex, United KingdomEyes and Vision
ROBERT S. LANEUniversity of California, BerkeleyZoonoses, Arthropod-Borne
STEPHEN G. A. LEAKInternational Trypanotolerance Centre, TheGambiaTsetse Fly
RICHARD E. LEE, JR.Miami University, Oxford, Ohio DormancyHibernation
M. J. LEHANEUniversity of Wales, BangorBlood Sucking
NORMAN C. LEPPLAUniversity of FloridaRearing of Insects
RICHARD J. LESKOSKYUniversity of IllinoisMovies, Insects in
VERNARD R. LEWISUniversity of California, BerkeleyIsoptera
JAMES K. LIEBHERRCornell UniversityColeoptera
JAMES E. LLOYDUniversity of FloridaBioluminescence
CATHERINE LOUDONUniversity of KansasAntennae
DWIGHT E. LYNNU.S. Department of AgricultureCell Culture
MICHAEL E. N. MAJERUSUniversity of Cambridge, United KingdomIndustrial MelanismLadybugsSymbionts, Bacterial
JON H. MARTINThe Natural History Museum, LondonSternorrhyncha
SINZO MASAKIHirosaki University, JapanAestivation
LINDA J. MASON Purdue UniversityExtension Entomology
FUMIO MATSUMURAUniversity of California, DavisDDTInsecticides
Contributors xix
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JOSEPH V. MCHUGHUniversity of GeorgiaColeoptera
TERRI L. MEINKINGUniversity of Miami School of Medicine Lice, Human
RICHARD W. MERRITTMichigan State UniversityAquatic HabitatsDipteraGrowth, Individual
JOCELYN G. MILLAR University of California, RiversidePheromones
THOMAS A. MILLERUniversity of California, Riverside Circulatory System
NICK MILLSUniversity of California, BerkeleyParasitoids
B. K. MITCHELLUniversity of Alberta, CanadaChemoreception
THOMAS E. MITTLERUniversity of California, BerkeleyHoneydew
EDWARD L. MOCKFORDIllinois State UniversityPsocoptera
MARK W. MOFFETTUniversity of California, BerkeleyPhotography of Insects
THOMAS P. MONATHAcambis Inc., Cambridge, Massachusetts Yellow Fever
JOHN C. MORSEClemson UniversityTrichoptera
MAX S. MOULDSAustralian Museum, SydneyCicadas
LAURENCE A. MOUNDCSIRO, Canberra, AustraliaThysanoptera
BRADLEY A. MULLENSUniversity of California, Riverside Veterinary Entomology
WERNER NACHTIGALLUniversitt der Saarlandes, GermanySwimming, Lake Insects
LISA NAGYUniversity of ArizonaEmbryogenesis
OLDRICH NEDVEDInstitute of Entomology, Academy of Sciences,Czech RepublicTemperature, Effects on Developmentand Growth
TIM R. NEWLa Trobe University, AustraliaConservation
GORDON M. NISHIDAUniversity of California, BerkeleyMuseums and Display Collections
BENJAMIN NORMARKUniversity of MassachusettsParthenogenesis
DAVID A. OBROCHTAUniversity of Maryland Biotechnology InstituteGenetic Engineering
BARRY M. OCONNORUniversity of MichiganMites
SEAN ODONNELLUniversity of WashingtonCasteColonies
PATRICK M. OGRADYAmerican Museum of Natural History, New York Drosophila melanogaster
DANIEL OTTEPhiladelphia Academy of Natural SciencesCrickets
TERRY L. PAGEVanderbilt UniversityCircadian Rhythms
TIMOTHY D. PAINEUniversity of California, RiversideBorers
JAMES O. PALMERAllegheny CollegeDermaptera
BERNARD PANNETONAgriculture and Agri-Food Canada, QuebecPhysical Control of Insect Pests
DANIEL R. PAPAJUniversity of ArizonaLearning
NIPAM H. PATELUniversity of ChicagoSegmentation
MATS W. PETTERSSONSwedish University of Agricultural Sciences Body Size
JOHN D. PINTOUniversity of California, RiversideHypermetamorphosis
RUDY PLARREFederal German Institute for Materials Researchand Testing, GermanyStored Products as Habitats
EDWARD G. PLATZERUniversity of California, Riverside Dog Heartworm
GEORGE POINAR JR.Oregon State UniversityAmber
DANIEL A. POTTERUniversity of KentuckyJapanese Beetle June Beetles
JERRY A. POWELLUniversity of California, BerkeleyLepidoptera
ROGER D. PRICEUniversity of MinnesotaPhthiraptera
RONALD PROKOPYUniversity of MassachusettsAgricultural EntomologyIntegrated Pest Management
ALEXANDER H. PURCELLUniversity of California, BerkeleyPhytotoxemiaPlant Diseases and Insects
DONALD L. J. QUICKEImperial College, University of London,United KingdomHymenoptera
FRANK J. RADOVSKYOregon State UniversityNeosomy
SUSAN M. RANKINAllegheny CollegeDermaptera
WILLIAM K. REISENUniversity of California, DavisMalaria
D. C. F. RENTZCalifornia Academy of Sciences, San FranciscoGrylloblattodeaOrthoptera
VINCENT H. RESHUniversity of California, BerkeleyInsecta, OverviewPollution, Insect Response toRiver Blindness
LYNN M. RIDDIFORDUniversity of WashingtonMolting
JAMES RIDSDILL-SMITHCSIRO, Canberra, AustraliaDung Beetles
xx Contributors
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ROY E. RITZMANNCase Western Reserve UniversityWalking and Jumping
ALAN ROBINSONIAEA Laboratories, Seibersdorf, Austria SterileInsect Technique
GENE E. ROBINSONUniversity of Illinois, Urbana-ChampaignDivision of Labor in Insect Societies
GEORGE K. RODERICKUniversity of California, BerkeleyGenetic VariationIsland Biogeography and Evolution
DAVID M. ROSENBERGFreshwater Institute, Winnipeg, CanadaPollution, Insect Response to
EDWARD S. ROSSCalifornia Academy of SciencesEmbiidina
MICHAEL K. RUSTUniversity of California, RiversideCat FleasUrban Habitats
MICHEL SARTORIMuseum of Zoology, Lausanne, SwitzerlandEphemeroptera
LESLIE SAUL-GERSHENZCenter for Ecosystem Survival, San Francisco,CaliforniaInsect Zoos
CARL W. SCHAEFERUniversity of ConnecticutProsorrhyncha
KATHERINE N. SCHICKUniversity of California, BerkeleyGallmaking and Insects
JUSTIN O. SCHMIDTSouthwestern Biological Institute, Tucson, ArizonaDefensive BehaviorVenomWasps
MICHELLE PELLISSIER SCOTTUniversity of New HampshireParental Care
THOMAS W. SCOTTUniversity of California, DavisDengue
J. MARK SCRIBERMichigan State UniversityPlantInsect Interactions
FRANTISEK SEHNALInstitute of Entomology, Academy of Sciences,Czech RepublicTemperature, Effects on Developmentand Growth
IRWIN W. SHERMANUniversity of California, RiversideBubonic Plague
RONALD A. SHERMANUniversity of California, IrvineMedicine, Insects in
DANIEL SIMBERLOFFUniversity of TennesseeIntroduced Insects
S. J. SIMPSONUniversity of Oxford, United KingdomNutrition
SCOTT R. SMEDLEYTrinity College, ConnecticutPuddling Behavior
EDWARD H. SMITHCornell University (Emeritus)Asheville, North CarolinaHistory of Entomology
JANET R. SMITHAsheville, North CarolinaHistory of Entomology
DANIEL E. SONENSHINEOld Dominion UniversityTicks
JOHN T. SORENSONCalifornia Department of Food and AgricultureAphids
JOSEPH C. SPAGNAUniversity of California, BerkeleySpiders
BEVERLY SPARKSUniversity of GeorgiaExtension Entomology
FELIX A. H. SPERLINGUniversity of Alberta, CanadaTeaching Resources
BERNHARD STATZNERUniversit Lyon I, FranceSwimming, Stream Insects
INGOLF STEFFANDEWENTERUniversity of Gttingen, GermanyGrassland Habitats
FREDERICK W. STEHRMichigan State UniversityCaterpillarsChrysalisCocoonLarvaMetamorphosisOcelli and StemmataPupa and Puparium
KENNETH W. STEWARTUniversity of North TexasPlecoptera
PETER STILINGUniversity of South FloridaGreenhouse Gases, Global Warming, andInsects
ANDREW J. STORERMichigan Technological University Forest Habitats
NIGEL E. STORKJames Cook University, AustraliaBiodiversity
RICHARD STOUTHAMERUniversity of California, RiversideWolbachia
MICHAEL R. STRANDUniversity of GeorgiaPolyembryony
NICHOLAS J. STRAUSFELDUniversity of ArizonaBrain and Optic Lobes
HELMUT STURMUniversity Hildesheim, GermanyArchaeognathaZygentoma
YOU NING SUAustralian National University, CanberraOrthoptera
R. K. SUAREZUniversity of California, Santa BarbaraMetabolism
DANIEL J. SULLIVANFordham UniversityHyperparasitism
SATOSHI TAKEDANational Institute of Agrobiological Sciences,JapanBombyx moriSericulture
CATHERINE A. TAUBERCornell UniversityNeuroptera
MAURICE J. TAUBERCornell UniversityNeuroptera
ORLEY R. TAYLORUniversity of KansasNeotropical African Bees
WILLIAM H. TELFERUniversity of PennsylvaniaVitellogenesis
K. J. TENNESSENTennessee Valley AuthorityOdonata
WALTER R. TERRAUniversity of So Paulo, BrazilDigestionDigestive System
CARSTEN THIESUniversity of Gttingen, GermanyGrassland Habitats
Contributors xxi
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xxii Contributors
F. CHRISTIAN THOMPSONU.S. Department of AgricultureNomenclature and Classification, Principles of
S. NELSON THOMPSONUniversity of California, Riverside MetabolismNutrition
JAMES H. THORPUniversity of KansasArthropoda and Related Groups
ROBBIN W. THORPUniversity of California, DavisPollination and Pollinators
ERICH H. TILGNERUniversity of GeorgiaPhasmida
PAIVI H. TORKKELIDalhousie University, CanadaMechanoreception
JAMES F. A. TRANIELLOBoston UniversityRecruitment Communication
TEJA TSCHARNTKEUniversity of Gttingen, GermanyGrassland Habitats
KAREN M. VAILUniversity of Tennessee, Knoxville Extension Entomology
R. G. VAN DRIESCHEUniversity of MassachusettsBiological Control of Insect Pests
MACE VAUGHANThe Xerces Society, Portland, OregonEndangered Insects
CHARLES VINCENTAgriculture and Agri-Food Canada, QuebecPhysical Control of Insect Pests
META VIRANT-DOBERLETNational Institute of Biology, Ljubljana, SloveniaVibrational Communication
P. KIRK VISSCHERUniversity of California, RiversideDance LanguageHomeostasis, Behavioral
PATRICIA J. VITTUMUniversity of MassachusettsSoil Habitats
GREGORY P. WALKERUniversity of California, RiversideSalivary Glands
J. BRUCE WALLACEUniversity of GeorgiaAquatic Habitats
GRAHAM C. WEBBThe University of Adelaide, AustraliaChromosomes
STEPHEN C. WELTERUniversity of California, BerkeleyCodling Moth
RONALD M. WESELOHConnecticut Agricultural Experiment StationHost Seeking, by ParasitoidsPredation/Predatory Insects
DIANA E. WHEELERUniversity of Arizona Accessory GlandsEggsEgg CoveringsOvariolesReproduction, FemaleReproduction, Female: Hormonal Control of
MICHAEL F. WHITINGBrigham Young UniversitySiphonapteraStrepsiptera
KIPLING W. WILLUniversity of California, BerkeleyResearch Tools, Insects as
STANLEY C. WILLIAMSSan Francisco State UniversityScorpions
SHAUN L. WINTERTONNorth Carolina State UniversityScales and Setae
DAVID L. WOODUniversity of California, BerkeleyForest Habitats
ROBIN J. WOOTTONUniversity of Exeter, United KingdomWings
JAYNE YACKCarleton University, Ottawa, CanadaHearing
JAMES E. ZABLOTNYU.S. Department of AgricultureSociality
SASHA N. ZILLMarshall UniversityWalking and Jumping
PETER ZWICKMax-Planck-Institut fr Limnologie, GermanyBiogeographical Patterns
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xxiii
T he Encyclopedia of Insects is a complete source of informationon the subject of insects, contained within a single volume.Each article in the Encyclopedia provides an overview of theselected topic to inform a broad spectrum of readers, frominsect biologists and scientists conducting research in relatedareas, to students and the interested general public.
In order that you, the reader, will derive the maximumbenefit from the Encyclopedia of Insects, we have provided thisGuide. It explains how the book is organized and how theinformation within its pages can be located.
SUBJECT AREAS
The Encyclopedia of Insects presents 271 separate articles onthe entire range of entomological study. Articles in the Ency-clopedia fall within twelve general subject areas, as follows:
Anatomy Physiology Behavior Evolution Reproduction Development and Metamorphosis Major Groups and Notable Forms Interactions with Other Organisms Interactions with Humans Habitats Ecology History and Methodology
ORGANIZATION
The Encyclopedia of Insects is organized to provide the maximumease of use for its readers. All of the articles are arranged in asingle alphabetical sequence by title. An alphabetical Table of
Contents for the articles can be found beginning on p. v ofthis introductory section.
As a reader of the Encyclopedia, you can use this alphabeti-cal Table of Contents by itself to locate a topic. Or you can firstidentify the topic in the Contents by Subject Area (p. xiii) andthen go to the alphabetical Table to find the page location.
So that they can be more easily identified, article titles beginwith the key word or phrase indicating the topic, with anydescriptive terms following this. For example, Temperature,Effects on Development and Growth is the title assigned tothis article, rather than Effects of Temperature on Develop-ment and Growth, because the specific term Temperature isthe key word.
ARTICLE FORMAT
Each article in the Encyclopedia begins with an introductoryparagraph that defines the topic being discussed and indicatesits significance. For example, the article Exoskeleton beginsas follows:
The exoskeleton is noncellular material that is located on topof the epidermal cell layer and constitutes the outermost partof the integument. The local properties and appearance ofthe exoskeleton are highly variable, and nearly all visiblefeatures of an insect result from the exoskeleton. Theexoskeleton serves as a barrier between the interior of theinsect and the environment, preventing desiccation and thepenetration of microorganisms. Muscles governing themovements are attached to the exoskeleton.
Major headings highlight important subtopics that are dis-cussed in the article. For example, the article Flight includesthese topics: Evolution of Flight; Aerodynamics; NeuralControl; Energetics; Ecology and Diversity.
GUIDE TO THEENCYCLOPEDIA
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CROSS-REFERENCES
The Encyclopedia of Insects has an extensive system of cross-referencing. References to other articles may appear either asmarginal headings within the AZ topical sequence, or asindications of related topics at the end of a particular article.
As an example of the first type of reference cited above, thefollowing marginal entry appears in the AZ article list betweenthe entries Beeswax and Biodiversity:
Beetle see Coleoptera
This reference indicates that the topic of Beetles is discussedelsewhere, under the article title Coleoptera, which is thename of the order including this group.
An example of the second type, a cross-reference at the endof an article, can be found in the entry DDT. This articleconcludes with the statement:
See Also the Following ArticlesInsecticides Integrated Pest Management Pollution
This reference indicates that these three related articles allprovide some additional information about DDT.
BIBLIOGRAPHY
The Bibliography section appears as the last element of anarticle, under the heading Further Reading. This section listsrecent secondary sources that will aid the reader in locatingmore detailed or technical information on the topic at hand.Review articles and research papers that are important to amore detailed understanding of the topic are also listed here.
The Bibliography entries in this Encyclopedia are for thebenefit of the reader, to provide references for further readingor additional research on the given topic. Thus they typicallyconsist of a limited number of entries. They are not intended
to represent a complete listing of all the materials consulted bythe author or authors in preparing the article. The Biblio-graphy is in effect an extension of the article itself, and itrepresents the authors choice as to the best sources availablefor additional information.
GLOSSARY
The Encyclopedia of Insects presents an additional resource forthe reader, following the AZ text. A comprehensive glossaryprovides definitions for more than 750 specialized terms usedin the articles in this Encyclopedia. The terms were identifiedby the contributors as helpful to the understanding of theirentries, and they have been defined by these authorsaccording to their use in the actual articles.
INDEX
The Subject Index for the Encyclopedia of Insects contains morethan 7,000 entries. Within the entry for a given topic, refer-ences to general coverage of the topic appear first, such as acomplete article on the subject. References to more specificaspects of the topic then appear below this in an indented list.
ENCYCLOPEDIA WEB SITE
The Encyclopedia of Insects maintains its own editorial Web pageon the Internet at:
http://www.apnet.com/insects/
This site gives information about the Encyclopedia projectand features links to related sites that provide informationabout the articles of the Encyclopedia. The site will continueto evolve as more information becomes available.
xxiv Giude to the Encyc lopedia
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xxv
I would say that creating an encyclopedia of insects was aherculean task, but I think that sells the enterprise short.After all, Hercules only had twelve labors assigned to him,and twelve years to complete themwith insects, there areover 900,000 different species and many, many more storiesto tell. Twelve years from now, there will likely be even more.Why, then, would anyone undertake the seemingly impos-sible task of compiling an encyclopedia of insects? To anentomologist, the answer is obvious. For one thing, theresthe numbers argumentover 70% of all known species areinsects, so if any group merits attention in encyclopedicform, surely its the one that happens to dominate the planet.Moreover, owing in large part to their staggering diversity,insects are in more different places in the world than virtuallyany other organism. There are insects in habitats rangingfrom the high Arctic to tropical rainforests to petroleumpools to glaciers to mines a mile below the surface to caves tosea lion nostrils and horse intestines. About the only placewhere insects are conspicuously absent is in the deep ocean(actually, in deep water in general), an anomaly that hasfrustrated more than a few entomologists who have grownaccustomed to world domination. Then theres the fact thatinsects have been around for longer than most other high-profile life-forms. The first proto-insects date back some 400million years; by contrast, mammals have been around onlyabout 230 million years and humans (depending on howtheyre defined) a measly one million years.
Probably the best justification for an encyclopediadevoted to insects is that insects have a direct and especiallyeconomic impact on humans. In the United States alone,insects cause billions of dollars in losses to staple crops, fruitcrops, truck crops, greenhouse and nursery products, forestproducts, livestock, stored grain and packaged food,clothing, household goods and furniture, and just aboutanything else people try to grow or build for sale or for their
own consumption. Beyond the balance sheet, they causeincalculable losses as vectors of human pathogens. Theyreinvolved in transmission of malaria, yellow fever, typhus,plague, dengue, various forms of encephalitis, relapsing fever,river blindness, filariasis, sleeping sickness, and innumerableother debilitating or even fatal diseases, not just abroad inexotic climes but here in the United States as well. All told,insects represent a drag on the economy unequaled by anyother single class of organisms, a seemingly compellingreason for keeping track of them in encyclopedic form.
In the interests of fairness, however, it should bementioned that insects also amass economic benefits in amagnitude unequaled by most invertebrates (or even,arguably, by most vertebrates). Insect-pollinated crops in theUnited States exceed $9 billion in value annually, and insectproducts, including honey, wax, lacquer, silk, and so on,contribute millions more. Insect-based biological control ofboth insect and weed pests is worth additional millions inreclaimed land and crop production, and even insect disposalof dung and other waste materials, although decidedlyunglamorous, is economically significant in fields, rangelands,and forests throughout the country.
So, for no reason other than economic self-interest, theresreason enough for creating an encyclopedia of insects. Butwhat can be learned from insects that cant be learned froman encyclopedia of any other abundant group of organisms?Basically, the biology of insects is the biology of small size.Small size, which has been in large part responsible for theoverwhelming success of the taxon, at the same time imposesmajor limits on the taxon. The range in size of livingorganisms, on earth at least, encompasses some 13 orders ofmagnitude (from a 100 metric ton blue whale to rotifersweighing less than 0.01 mg). Insects range over five ordersof magnitudefrom 30-g beetles to 0.03-g fairyfliessoeight orders of magnitude are missing in the class Insecta.
FOREWORD
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Problems at the upper limit involve support, transport, andovercoming inertia, issues clearly not critical for organisms,like insects, at the lower end of the range.
We humans, in the grand scheme of things, are big creaturesand as a consequence we interact with the biological and phys-ical world entirely differently. Rules that constrain humanbiology often are suspended for insects, which operate by acompletely different set of rules. The constraints and benefitsof small size are reflected in every aspect of insect biology.They hear, smell, taste, and sense the world in every other waywith abilities that stagger the imagination. They are capableof physical feats that seem impossiblemost fly, some glowin the dark, and others control the sex of their offspring andeven occasionally engage in virgin birth, to cite a few examples.Their generation times are so short and reproductive rates sohigh that they can adapt and evolve at rates that continuallysurprise (and stymie) us. The environment is patchier tosmaller organisms, which can divide resources more finelythan can large, lumbering species. Thus, they can make aliving on resources so rare or so nutrient-poor that it defiesbelief, such as nectar, dead bodies, and even dung.
So theyre profoundly different from humans and otherbig animals, and the study of insects can offer many insights
into life on earth that simply couldnt be gained from a studyof big creatures. By the same token, though, they are cutfrom the same cloththe same basic building blocks of life,same genetic code, and the likeand their utility as researchorganisms has provided insights into all life on the planet.
The Encyclopedia of Insects contains contributions fromsome of the greatest names in entomology today. Such a workhas to be a collective effort because nobody can be an expertin everything entomological. Even writing a foreword forsuch a wide-ranging volume is a daunting task. To be such anexpert would mean mastering every biological science frommolecular biology (in which the fruit fly Drosophila melanogasterserves as a premier model organism) to ecosystem ecology (inwhich insects play an important role in rates of nutrientturnover and energy flow). But, because insects, through theirubiquity and diversity, have had a greater influence on humanactivities than perhaps any other class of organisms, to be theultimate authority on insects also means mastering the minu-tiae of history, economics, art, literature, politics, and evenpopular culture. Nobody can master all of that informationand thats why this encyclopedia is such a welcome volume.
May R. Berenbaum
xxvi Foreword
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xxvii
I nsects are ever present in human lives. They are at once aweinspiring, fascinating, beautiful, and, at the same time, ascourge of humans because of food loss and disease. Yetdespite their negative effects, we depend on insects forpollination and for their products. As insects are the largestliving group on earth (75% of all animal species), anyunderstanding of ecological interactions at local or globalscales depends on our knowledge about them. Given thecurrent interest in biodiversity, and its loss, it must beremembered that insects represent the major part of existingbiodiversity. Aesthetically, insect images are often with us aswell: early images include Egyptian amulets of sacred scarabs;modern images include dragonfly jewelry, butterflystationery, and childrens puppets.
The idea of an Encyclopedia of Insects is new, but theconcept of an encyclopedia is quite old. In 1745, Diderotand DAlembert asked the best minds of their eraincludingVoltaire and Montesquieuto prepare entries that wouldcompile existing human knowledge in one place: the worldsfirst encyclopedia. It took over 20 years to finish the firstedition, which became one of the worlds first best-sellingbooks and a triumph of the Enlightenment.
What do we intend this encyclopedia to be? Our goal is toconvey the exciting, dynamic story of what entomology istoday. It is intended to be a concise, integrated summary ofcurrent knowledge and historical background on each of thenearly 300 entries presented. Our intention has been to makethe encyclopedia scientifically uncompromising; it is to becomprehensive but not exhaustive. Cross-references point thereader to related topics, and further reading lists at the end ofeach article allow readers to go into topics in more detail. Thepresence of a certain degree of overlap is intentional, becauseeach article is meant to be self-contained.
The Encyclopedia of Insects also includes organisms that arerelated to insects and often included in the purview of
entomology. Therefore, besides the members of the classInsectathe true insectsthe biology of spiders, mites, andrelated arthropods is included. The core of this encyclopediaconsists of the articles on the taxonomic groupsthe 30 orso generally accepted orders of insects, the processes thatinsects depend on for their survival and success, and therange of habitats they occupy. The fact that entomology is adynamic field is emphasized by the discovery of a new orderof insects, the Mantophasmatodea, just as this encyclopediawas being completed. This is the first order of insects to bedescribed in over 80 years, and we are pleased to be able toinclude it as an entry, further underscoring that there is muchleft to learn about insects. Some topics, especially the posterinsectsthose well-known taxa below the level of orders forwhich entries are presentedmay not cover all that aredesired by some readers. Given insect biodiversity, yourindulgence is requested.
We have gathered over 260 experts worldwide to write onthe entries that we have selected for inclusion. Thesespecialists, of course, have depended on the contributions ofthousands of their entomological predecessors. Because themodern study of entomology is interdisciplinary, we enlistedexperts ranging from arachnologists to specialists in zoonoticdiseases. Given that the two of us have spent over 25 com-bined years as editors of the Annual Review of Entomology,many of our contributors were also writers for that peri-odical. We thank our contributors for putting up with ourcompulsive editing, requests for rewrites, and seeminglyendless questions.
Our intended audience is not entomological specialistsbut entomological generalists, whether they be students,teachers, hobbyists, or interested nonscientists. Therefore, tocover the diverse interests of this readership, we haveincluded not just purely scientific aspects of the study ofinsects, but cultural (and pop-cultural) aspects as well.
PREFACE
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We thank the staff of Academic Press for their encour-agement and assistance on this project. Chuck Crumly hadthe original concept for this encyclopedia, convinced us of itsmerit, and helped us greatly in defining the format. ChrisMorris provided suggestions about its development. JocelynLofstrom and Joanna Dinsmore guided the book throughprinting. Gail Rice managed the flow of manuscripts andrevisions with skill and grace, and made many valuable sug-
gestions. Julie Todd of Iowa State University provided a crucialfinal edit of the completed articles. All these professionalshave helped make this a rewarding and fascinating endeavor.
We dedicate our efforts in editing the Encyclopedia ofInsects to our wives, Cheryl and Anja; their contributions toour entomological and personal lives have been indescribable.
Vincent H. Resh and Ring T. Card
xxviii Preface
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Acarisee Mites; Ticks
Accessory GlandsDiana E. WheelerUniversity of Arizona
T he accessory glands of reproductive systems in both femaleand male insects produce secretions that function in spermmaintenance, transport, and fertilization. In addition, accessoryglands in females provide protective coatings for eggs. Accessoryglands can be organs distinct from the main reproductive tract,or they can be specialized regions of the gonadal ducts (ductsleading from the ovaries or testes). Typically, glandular tissue iscomposed of two cell types: one that is secretory and the otherthat forms a duct. The interplay between male and femalesecretions from accessory glands is a key element in the designof diverse mating systems.
ACCESSORY GLANDS OF FEMALES
Management of Sperm and Other Male Contributions
Sperm management by females involves a wide range ofprocesses, including liberation of sperm from a sperma-tophore, digestion of male secretions and sperm, transport ofsperm to and from the spermatheca, maintenance of storedsperm, and fertilization.
Accessory gland secretions can have digestive functionsimportant in sperm management. First, digestive breakdown
of the spermatophore can free encapsulated sperm for fertil-ization and storage. Second, male contributions can providean important nutritional benefit to their mates. Female secre-tions can digest the secretory components of male seminal fluidto facilitate a nutritive role. In addition, females can digestunwanted sperm to transform it into nutrients. Third, femalesecretions in some species are required to digest sperm cover-ings that inhibit fertilization.
Transfer of sperm to and from the spermatheca is generallyaccomplished by a combination of chemical signals and mus-cular contractions. Secretions of female accessory glands in somespecies increase sperm motility or appear to attract spermtoward the spermathecae. Transport of fluid out through thewall of the spermatheca may also create negative pressure thatdraws in sperm.
Sperm can be stored for some length of time in sperma-thecae, with the record belonging to ant queens thatmaintain sperm viability for a decade or more. Secretions ofspermathecal glands are poorly characterized, and how spermis maintained for such extended periods is not known.Spermathecal tissue seems to create a chemical environmentthat maintains sperm viability, perhaps through reducedmetabolism. A nutritional function is also possible.
Transport of sperm out of storage can be facilitated by thesecretions of the spermathecal gland, which presumably activatequiescent sperm to move toward the primary reproductivetract. One potential function of female accessory glands thathas been explored only slightly is the production of hormone-like substances that modulate reproduction functions.
Production of Egg Coverings
Female accessory glands that produce protective coverings foreggs are termed colleterial glands. Colleterial glands havebeen best characterized in cockroaches, which produce anoothecal case surrounding their eggs. Interestingly, the left
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and right glands are anatomically different and have differentproducts. Separation of the chemicals permits reactions tobegin only at the time of mixing and ootheca formation. Otherprotective substances produced by glands include toxins andantibacterials.
Nourishment for Embryos or Larvae
Viviparous insects use accessory glands to provide nourish-ment directly to developing offspring. Tsetse flies and sheepkeds are dipterans that retain single larvae within their repro-ductive tracts and provide them with nourishment. They givebirth to mature larvae ready to pupate. The gland that producesthe nourishing secretion, rich in amino acids and lipids, isknown as the milk gland. The Pacific beetle roach, Diplopterapunctata, is also viviparous and provides its developing embryoswith nourishment secreted by the brood sac, an expandedportion of oviduct.
ACCESSORY GLANDS OF MALES
Accessory glands of the male reproductive tract have diversefunctions related to sperm delivery and to the design ofspecific mating systems.
Sperm Delivery
Males of many insects use spermatophores to transfer spermto females. A spermatophore is a bundle of sperm contained
in a protective packet. Accessory glands secrete the structuralproteins necessary for the spermatophores construction.Males of the yellow mealworm, Tenebrio molitor, have twodistinct accessory glands, one bean-shaped and the othertubular (Fig. 1). Bean-shaped accessory glands contain cellsof at least seven types and produce a semisolid material thatforms the wall and core of the spermatophore. Tubularaccessory glands contain only one type of cell, and itproduces a mix of water-soluble proteins of unknownfunction. Spermatophores are not absolutely required forsperm transfer in all insects. In many insects, male secretionscreate a fluid medium for sperm transfer.
Effects on Sperm Management and on the Female
The effects of male accessory gland secretions in the femaleare best known for the fruit fly, Drosophila melanogaster, inwhich the function of several gene products has beenexplored at the molecular level. Since insects have a diversityof mating systems, the specific functions of accessory glandsecretions are likely to reflect this variation.
In Drosophila, the accessory glands are simple sacsconsisting of a single layer of secretory cells around a centrallumen (Fig. 2). Genes for more than 80 accessory glandproteins have been identified so far. These genes code forhormonelike substances and enzymes, as well as many novel
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FIGURE 1 Male reproductive system of T. molitor, showing testes (T),ejaculatory duct (EJD), tubular accessory gland (TAG), and bean-shapedaccessory gland (BAG). [From Dailey, P. D., Gadzama J. M., and Happ, G.M. (1980). Cytodifferentiation in the accessory glands of Tenebrio molitor. VI.A congruent map of cells and their secretions in the layered elastic product ofthe male bean-shaped accessory gland. J. Morphol. 166, 289322. Reprintedby permission of Wiley-Liss, Inc., a subsidiary of John Wiley & Sons, Inc.]
FIGURE 2 Accessory gland of D. melanogaster. (A) The cells in this normalaccessory gland express b-galactosidase driven by a promoter of a gene for anaccessory gland protein. (B) A transgenic accessory gland, cells expressing thegene have been selectively killed after eclosion. These flies were used to explorethe function of accessory gland secretions. In transgenic males, accessory glandsare small and translationally inert. [From Kalb, J. M., DiBenedetto, A. J., andWolfner, M. F. (1993). Probing the function of Drosophila melanogasteraccessory glands by directed cell ablation. Proc. Natl. Acad. Sci. USA 90,80938097. Copyright 1993, National Academy of Sciences, U.S.A.]
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proteins. The gene products or their derivatives have diversefunctions, including an increased egg-laying rate, a reducedinclination of females to mate again, increased effectivenessof sperm transfer to a females spermatheca, and various toxiceffects most likely involved in the competition of sperm fromdifferent males. A side effect of this toxicity is a shortened lifespan for females. Other portions of the reproductive tractcontribute secretions with diverse roles. For example, theejaculatory bulb secretes one protein that is a majorconstituent of the mating plug, and another that hasantibacterial activity.
See Also the Following ArticlesEgg Coverings Spermatheca Spermatophore
Further ReadingChen, P. S. (1984). The functional morphology and biochemistry of insect
male accessory glands and their secretions. Annu. Rev. Entomol. 29,233255.
Eberhard, W. G. (1996). Female Control: Sexual Selection by CrypticFemale Choice. Princeton University Press, Princeton, NJ.
Gillott, C. (1988). ArthropodaInsecta. In Accessory Sex Glands, (Adiyodiand Adiyodi, eds.). Vol. 3 of Reproductive Biology of Invertebrates, pp. 319471. Wiley, New York.
Happ, G. M. (1992). Maturation of the male reproductive system and itsendocrine regulation. Annu. Rev. Entomol. 37, 303320.
Wolfner, M. F. (2001). The gifts that keep on giving: Physiological functionsand evolutionary dynamics of male seminal proteins in Drosophila.Heredity 88, 8593.
Acoustic Behaviorsee Hearing
Aedes Mosquitosee Mosquitoes
AestivationSinzo MasakiHirosaki University
A estivation is a dormant state for insects to pass the summerin either quiescence or diapause. Aestivating, quiescentinsects may be in cryptobiosis and highly tolerant to heat anddrought. Diapause for aestivation, or summer diapause, serves
not only to enable the insect to tolerate the rigors of summerbut also to ensure that the active phase of the life cycle occursduring the favorable time of the year.
QUIESCENCE
Quiescence for aestivation may be found in arid regions. Forexample, the larvae of the African chironomid midge,Polypedilum vanderplanki, inhabit temporary pools inhollows of rocks and become quiescent when the waterevaporates. Dry larvae of this midge can revive whenimmersed in water, even after years of quiescence. Thequiescent larva is in a state of cryptobiosis and tolerates thereduction of water content in its body to only 4%, survivingeven brief exposure to temperatures ranging from +102C to270C. Moreover, quiescent eggs of the brown locust,Locustana pardalina, survive in the dry soil of South Africafor several years until their water content decreases to 40%.When there is adequate rain, they absorb water, synchronouslyresume development, and hatch, resulting in an outburst ofhopper populations. The above-mentioned examples aredramatic, but available data are so scanty that it is difficult tosurmise how many species of insects can aestivate in a state ofquiescence in arid tropical regions.
SUMMER DIAPAUSE
Syndrome
The external conditions that insects must tolerate differsharply in summer and winter. Aestivating and hibernatinginsects may show similar diapause syndromes: cessation ofgrowth and development, reduction of metabolic rate,accumulation of nutrients, and increased protection by bodycoverings (hard integument, waxy material, cocoons, etc.),which permit them to endure the long period of dormancythat probably is being mediated by the neuroendocrine system.
Migration to aestivation sites is another component ofdiapause syndrome found in some species of moths, butter-flies, beetles, and hemipterans. In southeastern Australia, theadults of the Bogong moth, Agrotis infusa, emerge in late springto migrate from the plains to the mountains, where they aes-tivate, forming huge aggregations in rock crevices and caves(Fig. 1).
Seasonal Cues
Summer diapause may be induced obligatorily or facultativelyby such seasonal cues as daylength (nightlength) and tem-perature. When it occurs facultatively, the response to thecues is analogous to that for winter diapause; that is, the cuesare received during the sensitive stage, which precedes theresponsive (diapause) stage. The response pattern is, however,almost a mirror image of that for winter diapause (Fig. 2).Aestivating insects themselves also may be sensitive to the
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seasonal cues; a high temperature and a long daylength (shortnightlength) decelerate, and a short daylength (long night-length) and a low temperature accelerate the termination ofdiapause.
The optimal range of temperature for physiogenesis duringsummer diapause broadly overlaps with that for morphogenesis,or extends even to a higher range of temperature. Aestivatingeggs of the brown locust, L. pardalina, can terminate diapauseat 35C and those of the earth mite, Halotydeus destructor, dothis even at 70C. The different thermal requirements for
physiogenesis clearly distinguish summer diapause from winterdiapause, suggesting that despite the superficial similarity intheir dormancy syndromes, the two types of diapause involvebasically different physiological processes.
See Also the Following ArticlesCold/Heat Protection Diapause Dormancy Migration
Further ReadingCommon, I. F. B. (1954). A study of the biology of the adult Bogong moth,
Agrotis infusa (Boisd.) (Lepidopera: Noctuidae), with special reference to itsbehaviour during migration and aestivation. Austral. J. Zool. 2, 223263.
Furunishi, S., Masaki, S., Hashimoto, Y., and Suzuki, M. (1982). Diapauseresponse to photoperiod and night interruption in Mamestra brassicae(Lepidoptera: Noctuidae). Appl. Entomol. Zool. 17, 398409.
Hinton, H. E. (1960). Cryptobiosis in the larva of Polypedilum vanderplankiHint. (Chironomidae). J. Insect Physiol. 5, 286300.
Masaki, S. (1980). Summer diapause. Annu. Rev. Entomol. 25, 125.Matthe, J. J. (1951). The structure and physiology of the egg of Locustana
pardalina (Walk.). Union S. Afr. Dept. Agric. Sci. Bull. 316, 183.Tauber, M. J., Tauber, C. A., and Masaki, S. (1986). Seasonal Adaptations
of Insects. Oxford University Press, New York.
Africanized Beessee Neotropical African Bees
Agricultural EntomologyMarcos KoganOregon State University
Ronald ProkopyUniversity of Massachusetts
T he study of all economically important insects is theobject of the subdiscipline economic entomology.Agricultural entomology, a branch of economic entomology,is dedicated to the study of insects of interest to agriculturebecause they help increase crop production (e.g., pollinators);help produce a commodity (e.g., honey, silk, lacquer); causeinjury leading to economic losses to plants grown for food,feed, fiber, or landscaping; cause injury to farm animals; orare natural enemies of agricultural pests and, therefore,considered to be beneficial. Study of all fundamental aspectsof the ecology, life history, and behavior of insects associatedwith agricultural crops and farm animals falls within therealm of agricultural entomology. These studies provide thefoundation for the design and implementation of integratedpest management (IPM) programs (Fig. 1).
4 Agricul tural Entomolog y
FIGURE 2 Photoperiodic response in the noctuid M. brassicae controllingthe pupal diapause at 20C. Note the different ranges of photoperiod for theinduction of summer diapause (dashed line) and winter diapause (solid line).[From Furunishi et al., 1982, reproduced with permission.]
FIGURE 1 Bogong moths, Agrotis infusa, aestivating in aggregation on theroof of a cave at Mt Gingera, A. C. T., Australia. [Photograph from Common,I. (1954). Aust. J. Zool. 2, 223263, courtesy of CSIRO Publishing.]
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ECONOMIC ENTOMOLOGY
Insects are regarded by some as the main competitors ofhumans for dominance on the earth. Humans depend oninsects for pollination of many crops, for production of honeyand silk, for the decomposition of organic matter and therecycling of carbon, and for many other vital ecological roles.But it is the negative impact of insect pests that has been ofgreatest concern to humans. There are no reliable estimates ofaggregate losses caused by insects as vectors of pathogens andparasites of humans and domestic animals, as agents causingdirect damage to dwellings and other human-made structures,and as pests of crop plants and farm animals, but the amountsrun to probably hundreds of billions of dollars annually. Lossescaused by insects and vertebrate pests worldwide in the pro-duction of only eight principal food and cash crops (barley,coffee, cotton, maize, potato, rice, soybean, and wheat) between1988 and 1990 have been estimated at $90.5 billion.
In the late 1800s and early 1900s, entomology becameestablished in many academic and research institutions as adiscipline equal in rank with botany and zoology. Thediversity of insects and their economic importance was thejustification for ranking the study of a class of animals(Insecta) as being equivalent to the study of two kingdoms oforganisms (plants and animals other than insects). Throughthe first half of the twentieth century, there was a schismbetween basic and applied (or economic) entomology. Sincethen, common use of the expression economic entomologyhas declined, being replaced by designations of its principalbranches, such as agricultural entomology, forest entomology,
urban entomology, and medical and veterinary entomology. Adetailed historical account is beyond the scope of this article,but Table I provides a chronology of some landmarks in thedevelopment of agricultural entomology through the ages.
The realm of agricultural entomology includes all basicstudies of beneficial and pest insects associated with agriculturalcrops and farm animals. This article deals mainly with crops,but the general principles and concepts are equally applicableto farm animals. The starting point of such studies is a correctidentification of the insect species, in accordance with thescience known as biosystematics.
BIOSYSTEMATICS
Scientific nomenclature is a powerful tool for obtaining infor-mation about the basic biology of closely related species withina genus. When systematic studies have been extended beyondthe naming of species (taxonomy) and contain detailedinformation on geographic distribution, host records, andbiology of one or more species in a genus, it is often possibleto extrapolate the information to other closely related speciesof that genus. Although details of the biology must be ascer-tained for each individual species, biosystematics offers a blue-print to follow when dealing with a new pest. For example,the genus Cerotoma (Coleoptera: Chrysomelidae) contains 10to 12 species distributed from southern Brazil to the north-eastern United States. All seem to be associated with herbaceousplants in the family Fabaceae (bean family). The biology of twoof the species, C. trifurcata in North America and C. arcuatain South America (Fig. 2), has been studied extensively. Based
Agricul tural Entomolog y 5
FIGURE 1 A bridge metaphor: agricultural entomology is conceived as one of the main pillars, together with plant pathology and weed science, of supportingthe integrated pest management bridge. The bridge connects two-way traffic between crop production and crop protection. The other pillar is providedby the social sciences of economics and sociology. The main tension cables, which are system integration and information systems, hold the vertical lines thattogether give stability to the bridge; these are the tactical components of IPM. Under the bridge runs the river of ever shifting societal needs and demands.
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System integration and information systems
The flowing river of societal needs and demands
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on information for these two species, it is possible to inferthat the other species in the genus share at least some of thefollowing features: eggs are laid in the soil adjacent to growingleguminous plants; larvae feed on nitrogen-fixing root nodulesand pupate in soil inside pupal cases; first-generation adultsemerge when seedlings emerge, and second-generation adultsemerge when plants are in full vegetative growth, feeding firston foliage and, later on, switching to feeding on developingpods. The biosystematic information on the genus allowsstudents of agricultural entomology in South, Central, or
North America to understand, at least in general terms, therole of any other species of Cerotoma within their particularagroecosystem.
The flip side of this notion is recognition that closelyrelated and morphologically nearly undistinguishable(sibling) species may have many important biologicaldifferences. Examples of the critical need for reliablebiosystematics studies are found in the biological controlliterature. The present account is based on studies conductedby Paul DeBach, one of the leading biological controlspecialists of the twentieth century. The California red scale,Aonidella aurantii, is a serious pest of citrus in California andother citrus-producing areas of the world. Biological controlof the red scale in California had a long history of confusionand missed opportunities because of misidentification of itsparasitoids. The red scale parasitoid Aphytis chysomphali hadbeen known to occur in California and was not considered tobe a very effective control agent. When entomologists dis-covered parasitized scales during foreign exploration, theparasitoids were misidentified as A. chrysomphali and there-fore were not imported into California. It was laterdiscovered that the parasitoids were in fact two differentspecies, Aphytis lingnanensis and A. melinus, both moreefficient natural enemies of the California red scale than A.chrysomphali. Now A. lignanensis and A. melinus are theprincipal red scale parasitoids in California. Furtherbiosystematics studies have shown that what was oncethought to be single species, A. chrysomphali, parasitic on theCalifornia red scale in the Orient and elsewhere, and acci-dentally established in California, is in fact a complexincluding at least seven species having different biologicaladaptations but nearly indistinguishable morphologically.
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FIGURE 2 Morphological diversity and biological similarities in the genusCerotoma: four of the dozen known species are illustrated by male and femalespecimens. The species are clearly distinguishable by morphologicalcharacters, but they have similar life histories and behaviors. (Fromunpublished drawings by J. Sherrod, Illinois Natural History Survey.)
TABLE I Some Landmarks in the Historical Development of Agricultural Entomologya
Significant events Years ago from 2000 Date
Beginnings of agriculture 10,000 8000 B.C.E.First records of insecticide use 4,500 2500 B.C.E.First descriptions of insect pests 3,500 1500 B.C.E.Soaps used to control insects in China 900 1100Beginning of scientific nomenclature10th edition of Linnaeus, Systema Naturae 242 1758Burgeoning descriptions of insects 100200 18th and 19th centuriesFirst record of plant resistance to an insect 169 1831Charles Darwin and Alfred Wallace jointly present paper on the theory of evolution 142 1858First successful case of biological control: the cottony cushion scale, on citrus, in California,
by the vedalia beetle 112 1888First record of widespread damage of cotton in Texas by the cotton boll weevil 106 1894First record of an insect resistant to an insecticide 86 1914First edition of C. L. Metcalf and W. P. Flints Destructive and Useful Insects 72 1928Discovery of DDT and beginning of the insecticide era 61 1939First report of insect resistance to DDT 54 1946Term pheromone coined by P. Karlson and P. Butenandt, who identified first such substance in
the silkworm moth 45 1959First edition of Rachel Carlsons Silent Spring 48 1962Expression integrated pest management first appears in the press 32 1968Rapid development of molecular biology 20 1980sRelease of Bt transgenic varieties of cotton, corn, and potato 5 1990s
a Based in part on Norris et al. (2003).
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Knowledge of the name of a species, however, is not anindication of its true potential economic impact or pest status.A next important phase in agricultural entomology is, there-fore, the assessment of benefits or losses caused by that species.
PEST IMPACT ASSESSMENT
The mere occurrence of an insect species in association witha crop or a farm animal does not necessarily mean that thespecies is a pest of that crop or animal. To be a pest it mustcause economic losses. The assessment of economic lossesfrom pests is the subject of studies conducted underconditions that match as closely as possible the conditionsunder which the crop is grown commercially or the animalsare raised. Much of the methodology used in crop lossassessment has been established under the sponsorship of theFood and Agriculture Organization (FAO) of the UnitedNations as a means of prioritizing budget allocations andresearch efforts. Key data for these studies relate to thedetermination of the yield potential of a crop. The geneticmakeup of a crop variety determines its maximum yield inthe absence of adverse environmental factors. This is knownas the attainable yield. To determine the attainable yield, thecrop is grown under nearly ideal conditions; the actual yieldis what occurs when the crop is grown under normal farmingconditions. The difference between attainable and actualyields is a measure of crop loss (Fig. 3).
To assess crop losses and attribute the losses to a specificcause (e.g., the attack of a pest) requires setting up experimentsto isolate the effect of the pest from all other constraints.Methodologies vary with pest categorywhether the pestsare insects, vertebrates, plant pathogens, or weeds, forexample. The quantitative relationship between crop lossesand pest population levels is the basis for computing theeconomic injury level for the pest. The economic injury levelis a fundamental concept in IPM.
LIFE HISTORY AND HABITS
Once the identity and pest status of a species have been wellestablished, it becomes essential to extend the informationalbase on the life history and habits of the species to theconditions under which the crop is grown. Economically im-portant life history traits include information on develop-mental threshold temperatures and temperature-dependentdevelopmental rates. These data are used in modeling thephenology of the pest. Other essential studies include theorientation, feeding, host selection, and sexual behavior ofthe species. Many of these studies provide the foundation forstrategic planning in IPM and for the development of target-specific control tactics. For example, the study of sexualbehavior involves the definition of the role of pheromones inmating and the identification of those pheromones. These, inturn, may be used for monitoring pest incidence and abun-dance or in mating disruption, both valuable components ofIPM systems for many crops. The study of host selectionbehavior often leads to the identification of kairomones,equally important in IPM development.
PHENOLOGY
The life cycle of different insect species varies greatly, althoughall insects undergo the basic stages of development from eggto reproductive adult (or imago). Depending on the length ofthe life cycle, there is considerable variation in the number ofgenerations per year, a phenomenon called voltinism. A uni-voltine species has one generation per year; a multivoltinespecies may have many generations per year. The range ofvariation in the Insecta is evident when one considers that the17-year periodical cicada has one generation every 17 years,whereas whiteflies or mosquitoes may complete a generationin about 21 days. Under temperate climate conditions,generations often are discrete, but under warmer subtropicalconditions they frequently overlap. The definition of temporalperiodicity in an organisms develo