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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

Elongate, reddish-brown beetle on a white background.

Foreign Grain Beetles in New Construction

Even though fall is here, insects are still active, especially those that spend time indoors. We’ve received pictures and samples from across the state of small, reddish-brown beetles that appear inside homes. These insects are the foreign grain beetle.

Black beetles with orange or yellow spots feeding on a ripe tomato.

How Do I Keep Insects From Destroying My Garden Produce?

It is not unusual to see insects in a garden during the fall, but it can be frustrating to watch nearly ripe produce be destroyed by insects before it can be picked.

A pasture containing a mixture of grasses and alfalfa.

An identification guide for Alfalfa Insect Pests in South Dakota

Pictorial guide for common insect pests of alfalfa in South Dakota