Soybean aphid management: New challenges posed by insecticide resistance. Robert Koch Department of Entomology
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1 Soybean aphid management: New challenges posed by insecticide resistance Robert Koch Department of Entomology
2 Soybean aphid
3 Foliar insecticides for soybean aphid in MN Group 1 AChE inhibitors Group 3 Na channel modulators Group 4 nachr agonists 1A methomyl 3A alpha-cypermethrin 4A acetamiprid beta-cyflufthrin chlothianadin 1B acephate bifenthrin imidacloprid chlorpyrifos cyfluthrin thiamethoxam dimethoate deltamethrin esfenvalerate 4D flupyradifurone gamma-cyhalothrin lambda-cyhalothrin Group 9 Chordotonal organ permethrin modulator zeta-cypermethrin 9D afidopyropen
4 Foliar insecticides for soybean aphid in MB Group 1 AChE inhibitors Group 3 Na channel modulators Group 4 nachr agonists 1A methomyl 3A alpha-cypermethrin 4A acetamiprid beta-cyflufthrin chlothianadin 1B acephate bifenthrin imidacloprid Concept chlorpyrifos cyfluthrin thiamethoxam dimethoate deltamethrin Cygon, etc. Concept esfenvalerate 4D flupyradifurone Group 23 gamma-cyhalothrin Inhibitors of lambda-cyhalothrin Group 9 acetyl CoA Matador & Voliam Chordotonal organ carboxylase permethrin modulator 23 spirotetramat zeta-cypermethrin 9D afidopyropen Movento
5 Problem: Insecticide-resistant soybean aphids
6 Pyrethroid-resistant soybean aphid 1 st report in North America widespread reports of pyrethroid failures Laboratory bioassays confirmed resistance MN & IA Bifenthrin or λ-cyhalothrin ~40-fold resistance Hanson et al. 2017
7 Counties with pyrethroid performance issues Koch et al. 2018; Koch & Potter unpublished
8 Resistance monitoring (2017, 2018) Field-collected & laboratory aphids Glass-vial assays Diagnostic concentration (LC99) 10 adults per vial Mortality assessed after 4 h Biased-reduced GLM on controladjusted mortality, and one-sided Dunnett s test
9 Koch, unpublished χ 2 = , df = 18, P <
10 Koch, unpublished χ 2 = 444.9, df = 23, P <
11 Koch, unpublished χ 2 = , df = 20, P <
12 Koch, unpublished χ 2 = 347.3, df = 20, P <
13 Pyrethroid resistance General mechanisms Metabolic monooxygenases (cytochrome P450) esterases glutathione S-transferases Target site insensitivity knock down resistance (kdr; super-kdr) Reduced cuticular penetration Liu 2012
14 How did we get here? Reliance on few insecticide groups for aphid management Persistent infestations in/near MN Treating more than needed Treating fields below threshold Adding insecticide when targeting weeds or pathogens ( just in case ) Using low rates of insecticide
15 Insecticide resistance management
16 1. Don t spray when not needed
17 1. Don t spray when not needed 250 aphids/ plant Graph by Losey & DiTomasso
18 1. Don t spray when not needed Data from Ragsdale et al JEE 100(4): graphs from K. Tilmon
19 1. Don t spray when not needed 5,500 CAD Damage boundary 4,500 CAD 250 aphids/ plant Ragsdale et al. 2007; Koch et al. 2016
20 2. If you spray, do it right
21 2. If you spray, do it right Rates Use only labeled rates of insecticides High labeled rates may be preferred
22 2. If you spray, do it right Rates Nozzles, volume & pressure Small droplets Ground: >15 gal/ac at >30 psi Air: 3-5 gal/ac
23 2. If you spray, do it right Rates Nozzles, volume & pressure Environmental conditions Avoid spraying under conditions that promote droplet or vapor drift Windy, temperature inversion, etc.
24 3. Post-application scouting
25 3. Post-application scouting Scout field 3-5 days after spraying to check effectiveness No longer assume insecticides will provide effective control
26 4. If you have a failure
27 4. If you have a failure Alternate insecticide group for next spray Group numbers are on labels Mixtures are generally less effective for resistance management
28 5. Integrate other management tactics Host plant resistance Biological control
29 Host plant resistance
30 Hanson et al Host plant resistance
31 Biological control: Predatory bugs Parasitic wasps Lady beetles
32 Biological control: Selective insecticides Koch, unpublished
33 Biological control: Selective insecticides Koch, unpublished
34 Conclusions 4 years of pyrethroid failures & confirmed resistance Few tools available to manage soybean aphid Products Groups Matador 3A X Voliam Xpress 3A+28 X Concept 4A+3A X Cygon, etc. 1B Movento 23
35 Conclusions 4 years of pyrethroid failures & confirmed resistance Few tools available to manage soybean aphid What to do? Don t spray when not needed If you spray, do it right If you have a failure, alternate insecticide groups
36
37 Thank you Questions??? Robert Koch: All products listed in this presentation were examples and do not constitute endorsements
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