The 2019 growing season was challenging for farmers in many parts of the state, especially because cold and wet soil conditions in April significantly delayed planting. Thistle caterpillar was the most abundant insect statewide, though multiple species of caterpillars, Japanese beetle, soybean aphid, and soybean gall midge were observed in soybean.
Iowa State University
Hodgson, Erin W. and Dean, Ashley, "Summary of 2019 Insecticide Evaluations for Soybean Pests" (2020). Integrated Crop Management News. 2599.
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