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Alfalfa Weevil Activity Prediction Update: May 4, 2023

With warmer temperatures during the last week, there was an increase in the accumulation of degree days for alfalfa weevils. See our latest observations from around the state.

Alfalfa Weevil Activity Prediction Update: May 15, 2023

During the last week, the entire state reached enough degree days to have active alfalfa larvae. In areas with the highest accumulation of degree days, alfalfa should be scouted to ensure that alfalfa weevils don’t cause extensive defoliation.

Alfalfa Weevil Activity Prediction Update: May 19, 2023

Forecasted weather conditions are ideal for alfalfa weevil activity, and early detection of feeding activity will prevent extensive defoliation.

Alfalfa Weevil Activity Prediction Update: May 25, 2023

Last week we confirmed both alfalfa weevil adult and larval activity in alfalfa. Scouting should continue, as the forecasted warm weather will promote alfalfa weevil larvae feeding.

Alfalfa Weevil Activity Prediction Update: June 1, 2023

Throughout much of the state, enough degree days have accumulated for alfalfa weevil larvae to begin pupating. Scouting should continue until larvae are not observed.

Alfalfa Weevil Activity Prediction Update: June 5, 2024

Although the degree day estimates suggest that alfalfa weevils are no longer active in the fields and should be pupating, scouting has indicated otherwise.

Alfalfa Weevil Activity Prediction Update: June 19, 2024

Across South Dakota, degree day estimates indicate that alfalfa weevil activity should be completed. However, our field observations this week suggest otherwise.

Alfalfa Weevil Activity Prediction Update: May 9, 2024

Although May hasn’t been extremely warm, the accumulated degree days in South Dakota since January 1, 2024, suggest that alfalfa weevil larvae could be active in several areas of the state.

Alfalfa Weevil Activity Prediction Update: May 16, 2024

South Dakota finally warmed up and as a result, alfalfa across the state should be scouted for alfalfa weevil larvae.

Alfalfa Weevil Activity Prediction Update: May 24, 2024

Degree day accumulations continue to estimate alfalfa weevil activity throughout South Dakota. Alfalfa weevil activity is likely greater in southern counties, but alfalfa should continue to be scouted statewide.