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A yellow beetle with a black head, and square black markings on its back standing on a soybean leaf.

2020 South Dakota Overwintering Bean Leaf Beetle Predicted Mortality

Although bean leaf beetles won’t be emerging for a while yet, it is important to be prepared for potential early season defoliation. Once soybean are planted and begin emerging, the overwintering population of bean leaf beetle adults will move into soybean fields and begin feeding on the seedlings.

A small black bug with tan margins on the wings. This insect is resting on a blade of grass that is green with white spots.

Black Grass Bug Activity Expected in Coming Weeks

Spring green-up is the time to be watching for black grass bug activity. Large populations of this early-season pest can cause severe damage to pasture (up to 90% forage reduction) and infest the edges of wheat fields.

Adult female emerald ash borer

Emerald Ash Borer Insecticide Treatment Options

Fact sheet about insecticide treatment options for protecting ash trees against emerald ash borer.

Two adult wasps side-by-side. The left is black and yellow and is resting on a green leaf. The right is black, yellow and burnt orange in color and is resting on a piece of wood.

Wasp Activity Is Ramping Up

With their distinctive black and yellow stripes and tendency to hang out in groups, wasps receive attention no matter the time of year. As the weather warms up and spring progresses, you may notice more wasp activity in your yard or around your house.

A red, tractor-mounted sprayer with its tank being flushed by a hose connected to a large truck.

Preparing Spray Solutions: Mixing Order

Before mixing any pesticide always check the pesticide label for instructions on compatibility of two or more pesticides. Some herbicides and carriers require a compatibility agent, some are not compatible with a compatibility agent.

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

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.

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).

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 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.

Small white maggot next to a brown pill shaped pupa. Both a on soil with a yellow tape measure behind them

Watch for Seedcorn Maggots in Emerging Soybean

Of all of the potential early season pests, the seedcorn maggot is rarely an issue in South Dakota. However, we have started receiving reports of soybean fields that have poor emergence or seedling stand reductions occurring.