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Wanted: Soybean Aphids

Minnesota Extension Entomologists have reported pyrethroid resistance in soybean aphids in southwest and northwest Minnesota for the past 3 years.

Wanted: Soybean Aphids

Minnesota Extension Entomologists have reported pyrethroid resistance in soybean aphids in southwest and northwest Minnesota for the past 3 years. See recent article in Minnesota Crop News July 31, 2017 by Robert Koch, Bruce Potter and Phil Glogoza. We haven’t documented any insecticide resistance in soybean aphids in North Dakota. However, we are interested in collecting soybean aphids in sprayed fields that failed to provide good control so we can test these aphids for insecticide resistance. Scout fields 3-5 days after spraying to determine if your insecticide provided the desired level of control. Please let us know if you have any insecticide failures, especially a.i. bifenthrin and lambda-cyhalothrin: contact Jan (janet.knodel@ndsu.edu; 701-541-4094) or Pat (patrick.beauzay@ndsu.edu). Thank you for your help.

Continue to be vigilant on scouting for soybean aphids. When applying insecticides, be sure to use labeled rates and ensure adequate water volume (3-5 gpa via air, 10-20 gpa via ground) and high pressure (40 psi) for optimal control.

knodel.6

Janet J. Knodel

Extension Entomologist

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