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Orange larvae on discolored soybean stem.

Soybean Gall Midge in South Dakota

Fact sheet about soybean gall midge in South Dakota

several plots of alfalfa

Aphanomyces Root Rot of Alfalfa

Fact sheet on Aphanomyces Root Rot of Alfalfa

White and red caterpillar feeding within silken hideout on green soybean leaf.

Thistle Caterpillars Observed on Canada Thistle

Although thistle caterpillars are normally first observed in July or August, it is possible for them to appear earlier if weather conditions are favorable. While these caterpillars are generally not present in high numbers, they can cause severe defoliation.

Two mosquitoes, the one on the left being darker in color and the one on the right having a white band on its extended mouthpart. The white band is indicated with a red circle drawn over the picture.

Will Mosquitos Be an Issue During This Summer?

Although it may seem like mosquitos won’t be an issue this year due to drought conditions, it is important to remember that they don’t require large bodies of water to reproduce. Mosquitos can utilize standing bodies of water, small puddles or even stagnant water in containers or old tires.

Young woman applying insect repellant before an evening hike.

Enjoying the Outdoors Without Tick and Mosquito Bites

Outdoor activities seem extra inviting this time of year, and many people are already enjoying the long days and warmer temperatures. Ticks and mosquitoes share the outdoors with us, but there are things you can do to prevent bites from both.

Mosquito resting on a dandelion seed head.

West Nile Virus Update: Sept. 17, 2021

The South Dakota Department of Health's latest update indicated that West-Nile-virus-positive mosquitoes were detected in Beadle, Brookings, Brown, Codington, Hand, Hughes, Lincoln and Minnehaha counties in South Dakota.

Field with extensive injury caused by fall armyworm caterpillars.

Fall Armyworm Caterpillars Causing Issues in South Dakota

This week we started to receive reports of pastures and alfalfa stands that have been heavily fed on by fall armyworm caterpillars. Typically, these pests are not an issue in South Dakota. However, populations have been very large in many states during 2021, and they have now moved into South Dakota.

A wheat field that is bright yellow due to infection of Wheat streak mosaic virus.

Wheat Streak Mosaic of Wheat

Fact sheet about symptoms, disease cycle, risk factors and management of Wheat streak mosaic disease

Tan grasshopper with light colored stripes on its back sitting on the soil surface.

Will Grasshoppers Be an Issue in 2021?

With much of South Dakota experiencing dry conditions this year, grasshoppers are one of the insect pests that will need to be monitored. Large grasshopper populations may cause economic loss in cash crops and reduce forage in range and pasture lands.

Mosquito resting on a dandelion seed head.

West Nile Virus Update: Aug. 2, 2021

As of Aug. 2, 2021, the South Dakota Department of Health indicated that West-Nile-virus-positive mosquitoes were detected in Brookings, Codington, Hughes, Lincoln and Brown counties in South Dakota.