Natural insecticides - Palm Beach County,...
Transcript of Natural insecticides - Palm Beach County,...
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Natural Insecticides
Eileen Buss, Ph.D.
Entomology & Nematology Dept., UF/IFAS
352-273-3976; [email protected]
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Learning Objectives
Know the major categories of natural products and microbial insecticides; give examples of each
Describe the general traits and give examples of botanical insecticides
Explain the differences, and pros/cons of soaps and oils
Know the difference between minimum and reduced risk products
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A. Natural Products
Major Categories:
Botanical products
Soaps and oils
Minerals
Microbials ** Just because a pesticide is natural
doesn’t mean it’s safe!
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1. Botanical Products
General traits:
Fast breakdown
Fast activity
IPM-friendly
Low toxicity (most)
Not phytotoxic
Expensive
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Some Botanical Products
Limonene
Linalool
Rotenone
Ryania
Sabadilla
Neem
Pyrethrum/Pyrethrins
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d-Limonene
Citrus extract (e.g., steam distilled orange
peel oil)
Effective against external pests of pets,
cockroaches, ants, fleas, locusts, weevils
Repellent, contact spray
http://agricultureguide.org/wp-content/
uploads/citrus-tree-wallpaper.jpg
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Linalool
Naturally-occurring terpene alcohol in many
flowers & spice plants (>200 plant species)
Used as a scent in 60-80% of perfumed
hygiene products & cleaning agents (e.g.,
soaps, detergents, shampoos, lotions)
Flea, tick, and mosquito control
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Rotenone
Acutely toxic alkaloid extracted from roots
of a tropical legume
Inhibits energy production affecting
electron transport
Used in garden dusts, flea powders
Very toxic to fish
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Ryania
Extracted from the stem of a woody S.
American plant
Stimulates calcium channels – paralysis
Active against pests of fruit trees
http://bibliotecas.csic.es/galeria/ryania.jpg
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Sabadilla
Extracted from seeds of a lily
Neurotoxin – binds to the sodium channels
Breaks down quickly in light
Target pests: caterpillars, leafhoppers, stink
bugs, squash bugs, thrips
Crops: vegetables, citrus, avocado, mango
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Neem
From seeds of the tropical neem tree
Broad spectrum (e.g., aphids, caterpillars, leafminers, thrips, whiteflies, mealybugs, scales, spider mites, crane flies, chinch bugs, billbugs, hyperodes weevil)
Active by contact or ingestion; kills and repels; disrupts feeding, insect reproduction, and molting ability
Soft on pollinators and other beneficial insects
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Pyrethrum, Pyrethrins
Derived from chrysanthemum flowers
Low mammalian toxicity
Rapid “knockdown” of flying insects; paralyzes
CNS
Synergized by piperonyl butoxide (PBO)
Breaks down quickly in sunlight; no residual
Expensive, but widely used
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2. Soaps and Oils
Insecticidal soaps
Horticultural oils
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Insecticidal Soaps
Made from salts in the fats and oils of
animals and plants (very safe)
Contact toxicity only – no residual
Kill by disrupting insect cuticle
Good vs. small, soft-bodied insects
(aphids, caterpillars, crawlers)
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Horticultural Oils
Highly refined petroleum-based oils
Useful vs. small or slow-moving, soft-bodied pests, (aphids, leafhoppers, scales, overwintering eggs, mites)
May prevent gas exchange through egg membranes, clog insect mouthparts, deter feeding or egg-laying
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Horticultural Oils
Advantages:
Non-toxic to vertebrates
No resistance has developed
Use is compatible with biological control
Disadvantages:
Must contact pests to have efficacy
(no residual)
May cause phytotoxicity (leaf
burning) if too concentrated
Phytotoxicity on
loquat leaves
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3. Mineral Insecticides
Sulfur
Diatomaceous earth
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Minerals: Sulfur
Oldest known pesticide
Possibly phytotoxic
DO NOT mix with oils
Target pests: spider mites, psyllids,
thrips
Crop: vegetables, fruit crops
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Diatomaceous Earth
Mined from fossilized silica shell of
diatoms (algae)
Abrades and dries out insect cuticle
May be mixed with pyrethrins
Target pests: slugs, grasshoppers,
millipedes, sowbugs
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4. Microbial Insecticides
Commercial products that contain pathogens
or microbially-derived toxins / by-products that
kill insects
Fungi
Bacteria
Viruses
Protozoa
Nematodes (not really a microbe…)
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Microbial Insecticides: Benefits
Specific to their target pest(s);
No non-target effects
Considered non-toxic to humans
PPE may not be needed
Can be applied with standard pesticide
equipment
Applications should be done to minimize factors
that could decrease efficacy
Can be important rotation products
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1) Insect Pathogenic Fungi
Spores grow on the insect cuticle, then
hyphae penetrate the cuticle and grow
inside the body, soon killing the insect
Fungus-infected chinch bug (left) & whiteflies (right)
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Fungus is naturally in soil & infects insects
Infects ~200 arthropod species (used for ticks,
beetles, flies, gnats, thrips), but is safe for use
around mammals
Spores grow on insect cuticle, then hyphae penetrate
the cuticle and grow inside the body, soon killing the
insect. The cadaver’s cuticle becomes red. In high
humidity, a white mold grows on the cadaver, which
turns green as spores are produced.
Green Muscardine Disease
Metarhizium anisopliae
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Green June
beetle grubs
killed by
Metarhizium
anisopliae
Japanese beetle
grub infected
with Metarhizium
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Fungi do not need to be ingested to work
Infected insects die within a few days to a week
Greatest mortality in hot and humid conditions
Used for aphids, whiteflies, mealybugs, thrips,
beetles, flies, gnats and ticks.
Some trade names: Naturalis T, Botanigard
Avoid tank-mixing with fungicides
White Muscardine Disease
Beauveria bassiana
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A bluegrass billbug adult
(above) and Japanese beetle
larva (right) infected with
Beauveria.
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A gypsy moth larva infected with a
fungus, Entomophaga maimaiga.
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2) Bacterial Insecticides
Spore-forming, rod-shaped bacteria in the
genus Bacillus
Produced commercially by fermentation
Commonly occur in soils
Must be eaten to be effective
Apply with standard pesticide equipment
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Bt var. kurstaki - used since 1950’s to
control leaf-eating caterpillars
Very low vertebrate toxicity
Short residual in sunlight
Works better against small larvae than vs.
larger ones
Bacillus thuringiensis (Bt)
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Diseased (left) and normal (right) grubs.
Note the color of the hemolymph where the leg was cut off.
Dan Potter, Univ. of KY
Milky Spore Disease (Paenibacillus popilliae)
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3) Viruses
Highly specific to plant pests (e.g., moths,
beetles, sawflies)
Must be ingested, act on the gut, go into
the blood, multiply, and cause death
Not usually commercially available
Example: nuclear polyhedrosis
virus (NPV)
A gypsy moth larva
killed by a viral disease.
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4) Protozoa
Nosema locustae
Grasshopper control
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5) Entomopathogenic Nematodes
Microscopic, unsegmented worms
Attack various insects (e.g., soil insects,
wood borers)
Enter host’s body through mouth & spiracles,
release and feed on bacteria, reproduce
inside insect body, bacteria kill the host
Don’t damage plants – have different
mouthparts
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Nematode Species
Several species (Steinernemaspp., Heterorhabditis spp.) occur naturally in the soil, but some can be purchased
Some insecticides, like imidacloprid (Merit), may slow grub behavior down and make them more susceptible to nematode infection
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Insects infected with
Steinernema nematodes are
usually light tan in color.
Note the adults (larger
nematodes) and the
infective juveniles (the tiny
nematodes forming a cloud
around the grub.
Insects infected with
Heterorhabditis
nematodes are usually
a reddish color.
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B. Other Terminology
Organic
Minimum risk
Reduced risk
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USDA National Organic Program
What is organic?
Organic production is a system that is managed in accordance with the Organic Foods Production Act (OFPA) of 1990 and regulations in Title 7, Part 205 of the Code of Federal Regulations to respond to site-specific conditions by integrating cultural, biological, and mechanical practices that foster cycling of resources, promote ecological balance, and conserve biodiversity. The National Organic Program (NOP) develops, implements, and administers national production, handling, and labeling standards.
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Minimum Risk Pesticides
Exempt from EPA registration
Contain active ingredients listed in “the 25b
list” and inert ingredients in “the 4A list”
Must display pesticide use directions, all
ingredients and their percent
concentrations
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Reduced-Risk Pesticides
Reduced risk to human health
Reduced risk to non-target organisms
including fish, birds and natural enemies
Reduce ground and surface water
pollution
Low use rate, low pesticide resistance
potential
Compatible with IPM
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