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Who's in Your Soybean Fields?
Soybean aphids migrated to the US in the late 1990's. Their impact on yields has been studied and recommendations to control aphids are known. Throughout the US Midwest the economic injury level is set at an infestation threshold of 250 aphids per soybean plant, with 80% of the field infested during the R1-R5 growth stage. If you see that level of infestation an insecticide application is economically justified.
The 250 count threshold accounts for a 5 to 7 day lead time for an application to be made and where the aphid population could increase to 1000/plant and a reduction in yield greater than 5 bu/A realized.
To maximize your soybean yields:
- Scout early looking for leading indicators of aphid infestations: (wooded areas near buckthorn)
- Follow up with additional scouting in problem areas
- Understand the life cycle of aphids to better catch their infestation cycle
- Use spray technology that improves efficacy
Northern regions are
more prone to see aphids infestations due to climate conditions where aphids thrive. August weather with temperatures under 90°F limited rain events seem to culture aphid populations to flare up.
To enhance your contact application in dense canopies that soybeans present in August use Guardian Air Twin (GAT) nozzles. GAT nozzles provide forward and rear facing sprays that are demonstrated to deposit sprays deep within complex canopies.
Hypro. Right on Technology, Right on Target.
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