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![Page 1: 1 Nematode Management in Corn and Soybean Jason Bond, Plant Pathologist Southern Illinois University jbond@siu.edu 618-453-4309.](https://reader031.fdocuments.net/reader031/viewer/2022032703/56649d2e5503460f94a05ab2/html5/thumbnails/1.jpg)
1
Nematode Management in Corn and Soybean
Jason Bond, Plant PathologistSouthern Illinois University
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Nematodes as Pathogens
• Nematodes in corn production
• Why the interest now?• Potential impact of
nematodes• Management options
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•Soilborne Diseases of Soybean
•Foliar Diseases of Corn and Soybean
•Nematodes in Corn and Soybean
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Nematodes as Pathogens• 10% of all nematodes are parasites of plants.
• Many species attack corn and soybean.
• Generally, the nematode and symptoms are not seen.
• Host resistance is the exception.
Nemapix
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ANIMALIA
Radial Symmetry Bilateral Symmetry
“ROUNDWORMS”
“FLATWORMS”Coelomata
AcoelomataPseudocoelomata
NEMATODAPLATYHELMINTHES
Arthropoda
Mollusca
ANNELIDA
Higher Animals(Vertebrates)
Hydras, JellyfishSea urchins
What is a Nematode
Courtesy of EC McGawley, LSU
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50%
10%
15%25%
Plant
Animal
Free-Living
Marine
PHYLUM: NEMATODA
Courtesy of EC McGawley, LSU
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Courtesy of EC McGawley, LSU
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Non-Plant Parasites
Courtesy of EC McGawley, LSU
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ENDOPARASITES
ECTOPARASITES
Lesion Nematode
Dagger Nematode
Root-Knot Nematode
PLANT PARASITIC NEMATODES
Images courtesy of Nemapix
Needle Nematode
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Images courtesy of Nemapix
How Nematodes Feed
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Nematodes in Corn Common Name• Sting nematode• Needle nematode• Stubby rt. nematode• Lance nematode• Root-lesion nematode• Dagger nematode• Root-knot nematode• Stunt nematode• Spiral nematode• Ring nematode
Scientific NameBelonolaimus spp.Longidorus spp.Paratrichodorus spp. Hoplolaimus spp.Pratylenchus spp.Xiphinema spp. Meloidogyne spp.Tylenchorhynchus spp.Helicotylenchus spp.Mesocriconema spp.
Most of these nematodes are ubiquitous in the U.S.
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Nematodes in Corn Common Name• Sting nematode• Needle nematode• Stubby rt. nematode
------• Lance nematode• Root-lesion nematode• Dagger nematode• Root-knot nematode• Stunt nematode• Spiral nematode• Ring nematode
Damage Thresholds (½ cup soil)
1 to 6 = moderate damage
25+ = severe damage
50+ = severe damage
150+ = moderate damage
= Weak pathogens
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Soil Type = Greater Risk Sandy SoilSting nematodeNeedle nematodeStubby rt. nematodeRing nematodeLance nematodeRoot-knot nematodeStunt nematodeSpiral nematodeDagger nematodeRoot-lesion nematode
“Traditional Soil”Stunt nematodeLance nematodeRoot-lesion nematodeDagger nematodeSpiral nematode
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Corn
“Stunters” - found in sandy fields, yield loss can be devastating
- Needle, Sting, Dagger and Stubby Root Nematodes
“Debilitators” - found in traditional soil types, yield loss is often mild to moderate
- Lesion, Stunt, Spiral and Lance Nematodes
Nematode Pathogens
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Images courtesy of Nemapix
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Counter 20 CR
No Counter
Impact of corn nematodes - 2004
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1
23
4
56
Avg. Nematodes/100 cc soilNo Counter 165 a
Counter 43 b
Counter
No Counter
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Nematode Population Densities
Sample Dagger Lesion Spiral Sting Total ImportantNemas
1 Non-treated 156 8 328 57 549 221
2 Non-treated 82 33 123 1 239 116
3 Non-treated 66 25 57 66 214 157
4 Treated 16 8 114 1 139 25
5 Treated 41 16 254 10 321 67
6 Treated 21 11 206 4 242 36
Nematodes/ 100 cc soil
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Sting nematode was present~ 30 acres
Counter 163 bu/acreNon-treated 130 bu/acre
100 acres most without sting
Counter 166 bu/acre
Non-treated 162 bu/acre
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Carmi, SE Illinois 2005
130+ Sting nematodes/100 cc soil(Damage threshold is 1-5 /100 cc soil)
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Carmi, SE Illinois 2008
•Moderate – 7 needle nemas/100 cc soil
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Carmi, SE Illinois 2008
•Severe – 50 needle nemas/100 cc soil
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Needle Dagger
331 42
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Where have The nematodes been?
•They are “natives” with only a few exceptions
•Insect management via host resistance = less soil applied insecticides = happier nematodes
•Reduced tillage – several species prefer to live in soil that is not disturbed
•Less diverse rotations – corn followed by corn is preferred by most of these nematodes–Rotational crops soybean, cotton, alfalfa, vegetables, etc. are hosts to most of these nematodes.
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Consistency?• Active ingredient and/or formulation
• Amount/distribution of the pathogen
• Virulence of the pathogen
• Environment/weather
• Soil characteristics
• Host genetics
• Cultural practices
• etc.
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Needle and Dagger Nematodes - Irrigated field - Carmi, IL 2009
4.5 oz / 1000’
b
a
ab
Soil Applied
6 oz / 1000’ 6 rep trial
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Seed Treatments
b
a
b
Bayer Seed TreatmentsNeedle and Dagger Nematodes - Irrigated field in Carmi, IL 2008
6 rep trial
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Seed Treatments
Bayer Seed TreatmentsNeedle and Dagger Nematodes - Carmi - 2009
6 rep trialStandard = Vortex, Allegiance, Poncho
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Seed Treatments
Bayer Seed TreatmentsLesion, lance, spiral and stunt nematodes - Shawneetown - 2009
6 rep trialStandard = Vortex, Allegiance, Poncho
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Carmi, IL 2009170.7 bu/A
168.2 bu/A
190.2 bu/A
Seed Treatments
Non-treated
Fungicide/Insecticide
Fungicide/Insecticide/AVICTA
6 rep trial
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Seed Treatments
Syngenta Seed TreatmentsNeedle and Dagger Nematodes - Irrigated field in Carmi, IL 2009
6 rep trialStandard = Maxim,
Apron, Dynasty, Cruiser
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Maxim, Apron XL, Dynasty, Cruiser
Maxim, Apron XL, Dynasty, Cruiser +
AVICTA
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General Info
• Obvious symptoms are not common!• Yield losses vary depending on nematode
population densities, species present, etc. • Corn is at greatest risk in seedling stage
- High moisture in April-June, cool soils, poor growing conditions = perfect storm for corn damage
• Some species are active only from early to mid-season.
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When to Sample?Lesion, Root knot,Lance,Stubby Rt.
Sting, Needle,Dagger
Jan Feb Mar Apr May Jun Jul Aug Sep Oct Nov Dec
Crop in Ground
Damage
Detection, Diagnosis
DamageDamage
• Combined with yield maps, sampling can help diagnose problem areas
• Provides a background on types and density
Note: Corn nematode ID is much more time and resource consuming than for soybean cyst nematode.
Detection, Diagnosis
Damage
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Soybean
• Soybean cyst nematode - 90% of varieties are resistant, virulence management issues
• Root knot nematode - 7% of varieties are resistant
Nematode Pathogens
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Nematode Resistance in Soybean
• All resistant varieties allow juveniles to invade the roots.
• Resistance is expressed later during the feeding, development and/or reproduction of the females.
• Juveniles cause damage on entry and with movement in the roots.
• Entry causes portals for pathogens that cause diseases like SDS, BSR, etc.
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2002 2009
SCN Population: SCN HG Type 0, (Race 3),~550 SCN-resistant varieties, each year
Status of Resistance in SCN-Resistant Varieties
J. Bond, 2009 - www.vipsoybeans.org
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2009
SCN Population: SCN HG Type 2, 550 SCN-resistant varieties
Status of Resistance in SCN-Resistant Varieties
J. Bond, 2009 - www.vipsoybeans.org
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Bayer SCN Research
So
ybea
n y
ield
(b
u/A
)
Control Exp6 VOTiVO VOTiVO+ Gaucho Control+ Gaucho Fungicide
Carmi, IL 2008
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Seed Treatments
soybean Seed TreatmentsBayer nematicide seed treatments - Carmi - 2009
6 rep trial
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Summary• Nematode problems in corn and soybean
are going to get worse in the near term.
• A “frequent” (once every 4-6 years) sampling plan is required to manage nematodes.
• Sampling and detection issues – Handling, time consuming to process and
identify, more expensive ($25+), experienced technicians required, etc.
• Nematode diagnosis – Quality3
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Diagnostic LabsSouthern Illinois UniversityPlant, Soil, and Ag. Sys.1205 Lincoln Dr., Ag. 176Carbondale, IL 62901618-453-4309
Jason [email protected]
Purdue UniversityEntomology901 W. State StreetWest Lafayette, IN 47907-2089765-494-5901
Jamal [email protected]
University of IllinoisCrop SciencesAW101 Turner Hall1102 S. Goodwin Ave.Urbana, IL 61801217-265-5405
Terry [email protected]