Insect & Pests

Brown Wheat Mites Detected in South Dakota Wheat

Brown wheat mite infestations have been detected in South Dakota wheat. Typically, infestations are more commonly observed in fields experiencing drought stress, which is currently most of the state

Army Cutworms Causing Issues in South Dakota Wheat

Army cutworm caterpillars are active in South Dakota wheat fields. This activity is only going to increase with the forecasted temperatures.

Have you observed chemical management failure for alfalfa weevils?

SDSU Extension entomologists are currently looking for alfalfa fields with a past alfalfa weevil insecticide failures. We are collaborating with North Dakota State University and the University of Minnesota on project to determine if pyrethroid resistance exists in our respective states.

South Dakota Grasshopper Prediction for 2026

Almost every year in South Dakota there is a risk that grasshopper populations will reach levels capable of causing issues for producers. Unfortunately, our prediction for the 2026 growing season won’t change the trend.

Drought Conditions Magnifying Impact of Black Grass Bugs

Black grass bugs are a common early-season pest of forage grasses. Drought conditions exacerbate their impact by stressing plants and reducing their ability to tolerate and recover from feeding injury.

Pine Bark Beetle Meeting May 11 in Spearfish

May 04, 2026

SDSU Extension and USDA Forest Service staff will answer questions about pine bark beetles at a public meeting on May 11, 2026, at the Recreation Center multi-purpose room in Spearfish (122 Recreation Lane) from 6:30 to 8 p.m. MT.