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Insect & Pests

All Insect & Pests Content

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 head. The right is the adult stage and pictures a brown beetle with long snout.

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.

aerial view of South Dakota farm and surrounding land

Pest & Crop Newsletter

SDSU Extension publishes the South Dakota Pest & Crop Newsletter to provide growers, producers, crop consultants, and others involved in crop production with timely news pertinent to management of pests, diseases, and weeds in South Dakota.

Sunny field with large puffy clouds and blue sky
Jul 09

Pest and Crop Q&A Webinar

Join us Thursday, July 9, 2020 at noon CDT /11 a.m. MDT for this week's Q & A Session.

Crop Management, Crop Treatments

Sunny field with large puffy clouds and blue sky
Jul 02

Pest and Crop Q&A Webinar

Join us Thursday, July 2, 2020 at noon CDT /11 a.m. MDT for this week's Q & A Session.

Crop Management, Crop Treatments

Sunny field with large puffy clouds and blue sky
Jun 25

Pest and Crop Q&A Webinar

Join us Thursday, June 25, 2020 at noon CDT /11 a.m. MDT for this week's Q & A Session.

Crop Management, Crop Treatments

Sunny field with large puffy clouds and blue sky
Jun 18

Pest and Crop Q&A Webinar

Join us Thursday, June 18, 2020 at noon CDT /11 a.m. MDT for this week's Q & A Session.

Crop Management, Crop Treatments

Two dandelions side by side. The left has a bee foraging on it. The right has a hover fly foraging on it..

Why Those Dandelions in Your Yard Aren’t So Bad

While research has shown that pollinators, specifically honey bees, can’t survive on dandelion pollen alone, this doesn’t mean that the dandelions aren’t still important for pollinators.

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.

A few wheat plants showing heavy yellowing mosaic symptoms due to Wheat streak mosaic virus.

Wheat Streak Mosaic Disease Developing in Winter Wheat

Although the majority of winter wheat in the state is rated good to excellent in the recent USDA-NASS report, a few winter wheat fields in Central South Dakota have been diagnosed with wheat streak mosaic disease (WSMD) caused by wheat streak mosaic virus (WSMV).