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Green caterpillar with light colored stripe on back. Caterpillar is feeding on green plant.

Monitor Soybean and Sunflower for Alfalfa Webworm Caterpillars

In the last couple of weeks, we have received numerous reports of small green caterpillars in soybean and sunflower. The caterpillars have been described as producing webbing and moving extremely quickly when disturbed.

Green wheat stems with a gray slug feeding on them.

Slugs Causing Issues in Some South Dakota Wheat Fields

Slug activity in wheat fields has been reported in South Dakota. Although slugs are not normally an issue in South Dakota crops, they can pose a threat when field conditions are just right.

Three photos of blister beetles. The first is a black colored blister beetle on a purple flower. The second is a gray colored blister beetle on yellow flowers. The third is an orange-brown colored blister beetle feeding on a green leaf.

Check Alfalfa for Blister Beetle Activity

Blister beetles are becoming more common as we progress through the growing season. Recently, there have been multiple reports of blister beetles showing up in alfalfa fields.

Black caterpillar feeding on green soybean leaf.

Start Scouting Fields for Thistle Caterpillar Activity

Many of our summer insect pests overwinter in the Southern U.S. and rely on wind currents to travel north in the spring and summer. The thistle caterpillar is one of those pests.

Green sunflower leaves with two snails present on them.

Snails Observed in South Dakota Sunflower

Last week we received reports of snail populations causing issues in South Dakota sunflower fields. Snails are normally not an issue in South Dakota crops but like their slug relatives, they can pose a threat to crops when field conditions are just right.

Green and yellow grasshopper resting on a head of wheat.

Grasshoppers Are Causing Concerns in Close-to-Harvest Winter Wheat

During the end of last week, we received reports of grasshoppers feeding on winter wheat that was close to being ready to harvest. One of the questions with the report was, “What insecticide can be sprayed that won’t delay harvest?”

Small black fly on pale skin.

Monitor Livestock, Pets and Yourself for Eye Gnat Activity

While being outside this week, I noticed a lot of small gnats flying around my legs and really bothering my dogs. I caught a few and identified them as eye gnats. Although this pest is considered a nuisance in most cases, it is capable of transmitting diseases and pathogens.

Two caterpillars feeding on soybeans. Top: Green cloverworm caterpillar. Bottom: Alfalfa caterpillar.

Soybean Defoliators Are Active

It’s that time of the season when numerous defoliating insects can be observed in a single soybean field. Most of the defoliators at this time are green cloverworms and alfalfa caterpillars.

Sideview of cut zucchini showing a small white caterpillar with a black head.

Squash Vine Borers Strike Again: This Time They’re in the Produce!

The larvae of the squash vine borer can wreak havoc on squash plants by boring into the stems and slowly killing the plants. Unfortunately, they’ll do even more than that. They will also invade the developing produce.

Four green caterpillars feeding on kale.

Imported Cabbage Worms Are Chewing up My Garden!

One of the worst things to observe in your garden are caterpillars heavily defoliating your plants. But unfortunately, that’s exactly what the imported cabbageworms (cabbage white) caterpillars do.