Defoliating insects still making their presence known in Minnesota soybean

August 14, 2019

Robert Koch, Extension Entomologist

While soybean aphid numbers have been generally low this year, defoliating insects (especially green cloverworm and thistle caterpillar) have been abundant in soybean fields across much of Minnesota. I have also received some scattered reports of increasing defoliation from grasshoppers in northwest Minnesota and Japanese beetles in southeast Minnesota. To determine when to apply insecticides, rely on scouting and thresholds. Continue scouting through pod and seed development. This article contains a summary of scouting and thresholds for defoliating insects from an earlier Crop News article. View the entire article on the Minnesota Crop News Blog