Report insecticide failures for soybean aphid
During the 2015 growing season, failures of foliar insecticide applications to control soybean aphid were reported in growers' fields and at U of M Experiment Stations in Minnesota. In these areas of southern Minnesota, multiple applications were required to control this pest and soybean aphid resistance to pyrethroids was ultimately confirmed by laboratory assays.
We would like to ask for your help in identifying how serious and widespread this issue may be. If you experience an insecticide failure and suspect resistance, please consider sharing that information with us in the survey at the bottom of this page.
See "Insecticide resistance management in soybean" for more information on insecticide resistance and strategies for preventing or postponing the development of resistance.
What caused my insecticide failure
Insecticides can fail under several conditions. Before you assume that your insecticide failure is resistance, rule out these common factors:
- Misapplication of insecticide – This can include choosing the wrong insecticide, applying the wrong rate, and/or having poor application coverage.
- Unfavorable weather – Wind, rain and temperature can have an impact on insecticide effectiveness. For example, some pyrethroids can be less effective at high temperatures.
- Recolonization of the pest – In the case of soybean aphid, winged individuals from other fields may recolonize a field that had been treated.
If you can rule out these factors as potential causes for the insecticide failure, insecticide resistance might be the cause.
If you suspect insecticide resistance, please take a few minutes to fill out the following survey: