Content by Patrick Wagner

Alfalfa Plant Bugs Showing Up in Abundance

There have been several insect pests showing up in alfalfa this season, including the alfalfa plant bug. We consider the above-average spring temperatures and drought-stressed plants in Eastern South Dakota to be the primary drivers of these issues.

Blister Beetles Already Appearing in Alfalfa

Large blister beetles populations were observed while scouting alfalfa this past week. While they usually aren’t an issue until after the first cutting, this early activity means growers should monitor alfalfa fields prior to harvest for the remainder of the season.

Alfalfa Weevils Are Active in South Dakota

Alfalfa weevil larvae are active across South Dakota. Although they had a somewhat slower start this year, we are now observing all instars of the larvae in alfalfa fields.

Aster Leafhoppers Detected in South Dakota Wheat

Aster leafhoppers are present in wheat again this spring. For the last few years, aster leafhoppers have been a common occurrence in South Dakota wheat.

South Dakota Overwintering Bean Leaf Beetle Predicted Mortality: 2025-2026

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.

Dingy Cutworms Causing Issues in South Dakota Soybean

Dingy cutworms are commonly observed during the spring but typically do not reach major pest status. However, when the conditions are right, they can cause substantial feeding injury to seedling soybeans, as well as corn, wheat, and sunflower.

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.