Scout for Soybean Aphids in MN Fields

Categories: GROWING, SOYBEANS
Soybean Aphid Resistance 
   
Figure 1. Soybean aphids infesting a soybean leaf. (Photo courtesy of R. Kock, University of Minnesota)
 

Figure 2. Counties with reported failures of pyrethroids for control of soybean aphid. Red-shaded counties indicate those from which Extension entomologists received reports of failures. (Maps courtesy of B. Potter, University of Minnesota)
Management of Insecticide-resistant Soybean Aphids
North Dakota State University
Robert Koch, University of Minnesota; Erin Hodgson, Iowa State University; Janet Knodel, North Dakota State University; Adam Varenhorst, South Dakota State University
https://www.ag.ndsu.edu/publications/crops/management-of-insecticide-resistant-soybean-aphids
Soybean aphid populations are highly variable again this year.  Locally at the Stanton, MN, Agronomy in Action site aphid populations are nearing the 250 threshold in soybean demonstration plots. Favorable weather for rapid reproduction is in the works. 

Farmers looking to accelerate the scouting process, can turn to the University of Minnesota Extension, speed scouting methods.

Historically, we’ve been able to rely on insecticide applications to manage soybean aphids. Our reliance on only a few insecticide groups in combination with their biology & persistence has led them to develop resistance to the pyrethroid mode of action.  
  • If you choose to spray, be mindful of product labels and spray instructions.  After application, continue to scout closely for at least 2 weeks.
  • If your initial treatment doesn’t work, it’s unlikely that applying it a second time will be effective. Rule out other causes for error and rotate to a different insecticide group.
  • Maintain application setbacks from permanent water bodies to protect surface water from runoff, drift or leaching.
 
For more information on soybean aphid management in your area, get in touch with your Golden Harvest Seed Advisor.

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