Insect & Pests

All Insect & Pests Content

Numerous grayish-brown bugs gathering on a green stem.

False Chinch Bugs Back Again

False chinch bugs are active yet again in South Dakota. Although they are normally only a nuisance pest, their populations can become magnified during cool, wet springs.

Large mass of small green insects and plant debris present on green implement.

Watch for Pea Aphid Populations in Alfalfa

Recent reports have indicated that pea aphid populations are very large in some alfalfa fields and should continue to be monitored and possibly managed.

A teardrop shaped tan tick with eight legs and brown markings on a white background.

Winter Ticks in South Dakota

Winter ticks, also called moose ticks, are unlike other tick species because they are active during the winter months.

A steer standing in a feedlot. Its middle back has a visible bald spot due to lice.

Seeing cattle rubbing hair off due to lice infestations can be extremely frustrating. Not only are the cattle damaging fences and equipment, there also can be performance losses and health issues not to mention that the cattle are simply not as visibly appealing, which can be very important for seedstock producers or feeders selling backgrounded feeders.

grey to brown fly with large eyes and elongated mouthparts

What are Those Gigantic Flies?

As we progress later into the summer, we commonly see an increase in horse fly activity.

Two flies side-by-side. The left fly is a Western horse fly. The right fly is a deer fly.

Horse Flies and Deer Flies Becoming Abundant

The above-average precipitation this year has led to increased numbers of horse flies and deer flies across South Dakota. Widespread flooding and an overall abundance of available water has made conditions perfect for these flies.

Two photos of alfalfa weevils during different lifecycle stages. The left is the larva stage and has a longate, green larvae that looks like a caterpillar with white stripe running down the body and brown h

It’s Time to Scout for Alfalfa Weevils

The 2018 and 2019 alfalfa weevil populations were relatively low, and as a result, we didn’t receive very many calls regarding this pest during those years. However, 2020 has been quite a bit different, and alfalfa weevil populations seem to be much higher.

Green beetle larvae with a white stripe running down its body.

Alfalfa Weevil Activity Prediction Update: June 1, 2020

Activity of alfalfa weevils has been documented in many areas of South Dakota during the last week. At this time, the entire state has accumulated enough degree days for alfalfa weevils to be active.

Two insects. The left is a wasp with a dark head, reddish brown thorax (the segment behind the head), and a black and yellow banded abdomen. The right is a hornet with a yellow head, dark brown thorax (the segment behind the head), and a brown and yellow banded abdomen.

No, It’s Not a Murder Hornet.

By now, you’ve probably read headlines about the Asian giant hornets (aka “murder hornets”) that were spotted in Washington state and across the border in Canada. It is important to note that Asian giant hornets have only been confirmed in a small area of Washington and Canada. These wasps have not been observed in South Dakota or our neighboring states.

Alfalfa Weevil Activity Prediction Update: May 4, 2020

Temperatures continue to increase across South Dakota and the degree days are rapidly accumulating. With the exception of areas around Selby, Sisseton and Brookings, alfalfa weevil activity is likely in South Dakota.