Soybean Aphids

The mild and wet weather we have experienced this spring and summer has created the ideal condition for soybean aphids to emerge.  These conditions extend the survival time for the aphids.  Below is a refresher of what are aphids, what fields are at risk, how we should be scouting for aphids and insecticide treatments. 

What are soybean aphids?
  • Small, yellow bodied insects that have a black tipped cornicle
  • They are found on the underside of the newest growth on a soybean plant
  • Reduce plant vigor and growth by removing plant sap which is involved in photosynthesis
Scouting Methods
  • Flip top leaves over to see aphids
  • Highest threshold will be found along tree lines
  • Less than 40 aphids per plant = not infested
  • Greater than 40 aphids per plant = infested
  • Economical threshold is 250 aphids per plant with 80% of plants affected
  • Keep an eye out for natural enemies of aphids
    • Lady Beetles
    • Green Lacewigs
    • Insidious Flower Bug
Insecticide Products
  • Tundra: 2.1-6.4 fl oz./Acre
  • Tundra Supreme: 5.6-16.8 fl oz./Acre
  • Delta Gold: 1.5-2.4 fl oz./Acre
Centra Sota’s Yield Quest program offers scouting program.  Utilizing the scouting program will help identify if the soybean aphids are reaching the economic threshold.  Work with your Crop Advisor to identify a plan to tackle the aphids.  

Other local articles about soybean aphids with year.
http://blog-crop-news.extension.umn.edu/2018/07/soybean-aphid-infestations-are.html
http://www.startribune.com/as-aphids-spread-in-central-minnesota-soybean-farmers-face-pesticide-dilemma/488747301/
 
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