Soybean Insects
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Best Management Practices for Soybean Production
This is your unbiased, research-based guide to soybean production to help increase yield, reduce input costs and protect your investment.
All Soybean Insects Content
Soybean Aphids Detected in South Dakota
While scouting soybean aphids this week we observed small colonies of 5 to 10 soybean aphid nymphs. This indicates that the soybean aphids are just starting to arrive in South Dakota soybeans and weekly scouting for them should be occurring.
Green Caterpillars Causing Defoliation in Soybean
This week we observed several species of caterpillars in soybean fields. The most common species were the green cloverworm and the cabbage looper.
Dectes Stem Borer Adults Are Active in Soybean: 2025 Management Recommendations
Dectes stem borer adults have been collected from soybean in Southeastern South Dakota. The larvae of this pest are capable of reducing soybean yields by 10-15% due to tunneling activity in the main stem. Learn some tips for scouting and managing them this season.
Soybean Gall Midge Larvae Detected in South Dakota
Soybean gall midge larvae have been detected in soybean in southeastern South Dakota. Scouting for fields with infestations may explain wilting or dying soybean along field edges.
Dectes Stem Borer in South Dakota Soybeans
Fact sheet on Dectes stem borer in South Dakota soybeans
Grasshoppers Are Showing up in Large Numbers in Eastern South Dakota
While scouting spring wheat in Brookings County this week, we noticed grasshopper nymph populations that were close to threshold.
Survey of Grasshoppers in South Dakota
Fact sheet on the abundance and species diversity of grasshoppers in South Dakota
Dectes Stem Borer in Soybean Survey: 2023 and 2024 Results
During the 2023 and 2024 growing seasons, researchers at SDSU surveyed soybean in Eastern South Dakota for the presence of Dectes stem borer adults.
South Dakota Overwintering Bean Leaf Beetle Predicted Mortality: 2024-2025
Each year we evaluate the overwintering success of bean leaf beetles in South Dakota. For adult bean leaf beetles that successfully overwintered, emergence will begin in the spring and they will move into soybean fields.
South Dakota Grasshopper Prediction for 2025
In 2025, it is likely that grasshopper populations will once again reach levels capable of causing issues in some areas of the state. Scouting should begin shortly after planting in areas where they were problematic in 2024 and continue throughout the growing season.