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

Alfalfa Weevil Activity Prediction Update: April 14, 2020

The alfalfa weevil is a major spring insect pest of South Dakota alfalfa. Before 2018, this insect was reported as having large populations throughout much of South Dakota. However, during 2018 and 2019, we received fewer reports of alfalfa weevils, which may have been a result of the cooler and wetter spring conditions that were observed.

A color-coded precipitation probability map of the United States. The majority of South Dakota is predicted to have wetter than average precipitation, with the highest likelihood being in the southwest corner of the state. For a complete description, call SDSU Extension at 605-688-6729.

May 2020 Climate Outlook

On April 16, NOAA’s Climate Prediction Center released their climate outlook for May and the coming three-month period of May through July. There is a lot of uncertainty in the temperature outlook for the next one-to-three months in the Northern Plains Region.

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

Alfalfa Weevil Activity Prediction Update: April 20, 2020

During the last week, the colder weather that we experienced across South Dakota resulted in very little degree day accumulation. However, in some areas enough degree days have accumulated to potentially lead to adult activity within alfalfa fields.

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

Alfalfa Weevil Activity Prediction Update: April 27, 2020

It is finally warming up across much of South Dakota and that means the degree days are beginning to accumulate more rapidly. Alfalfa weevil activity is likely in areas around Rapid City, Hot Springs, Cottonwood, Mission, Pierre, Winner and Vermillion.

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.

A map of South Dakota illustrating soil temperatures on April 21, 2020. Temperatures throughout the state range from 41 to 56 degrees Fahrenheit. For more information, visit: https://climate.sdstate.edu/archive/maps/

Soil Temperature for Planting Spring Crops

Soil temperature is an important consideration for deciding when to begin planting spring crops. If producers in South Dakota would like a quick reference for soil temperatures in their area, the SD Mesonet network measures soil temperature at several weather stations throughout the state.

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.