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Adam Varenhorst

Assistant Professor & SDSU Extension Field Crop Entomologist

605-688-6854

Berg Agricultural Hall 308
Agronomy, Horticulture & Plant Science-2207A
University Station
Brookings, SD 57007

As the SDSU Extension Field Crop Entomologist I serve South Dakota stakeholders by addressing insect pest issues in field crops. I conduct applied research that focuses on corn, soybean, wheat and sunflower. I also assist the other extension entomologists to address questions pertaining to insect questions for the home and garden, urban insect pests and general entomology questions.

Also by Adam Varenhorst

Orange larvae on discolored soybean stem.

Soybean Gall Midge in South Dakota

Fact sheet about soybean gall midge in South Dakota

Elongate, reddish-brown beetle on a white background.

Foreign Grain Beetles in New Construction

As new homes are constructed around South Dakota, we continually receive questions about small, brown insects showing up in bathrooms and basements. These insects are foreign grain beetles.

Gray beetle with long antennae.

Dectes Stem Borer in Soybean

Although Dectes stem borers are more of an issue in South Dakota sunflower, they can also infest soybean. Thier larvae may cause soybean yield losses due to their feeding activity in the pith of the stem and also due to late-season lodging.