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Alfalfa Weevil Degree Day Update (05/30/19)

The degree day map shows that alfalfa weevil adults (200 Accumulated Degree Days, ADD) are emerged, and egg hatch (300 ADD) is occurring in southeastern and northwestern ND.

The degree day map shows that alfalfa weevil adults (200 Accumulated Degree Days, ADD) are emerged, and egg hatch (300 ADD) is occurring in southeastern and northwestern ND. Use a 15-inch sweep net to see if adults or larvae are present in alfalfa fields. The warmer weather this week should increase the rate of insect development. Scouting should begin immediately after egg hatch, and fields should be scouted weekly up through the first cutting. For information on scouting and thresholds, consult the NDSU Extension publication:

Integrated Pest Management of Alfalfa Weevil in North Dakota E1676

https://www.ag.ndsu.edu/publications/crops/integrated-pest-management-of-alfalfa-weevil-in-north-dakota

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Janet J. Knodel

Extension Entomologist

 

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