Crop & Pest Report

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Degree Day Update for Insects (6/7/12)

ALFALFA WEEVIL: The DD accumulation for alfalfa weevil as of June 4 indicates that larvae are present in most of North Dakota (371-595 DD) (source: NDSU NDAWN – Applications – Insect Degree Days). See Issue 4 of Crop & Pest Report for more information.

Alfalfa weevil images

Sunlfower GDD mapLEAFY SPURGE FLEA BEETLE:  Using the sunflower GDD model from NDAWN, the DD accumulation indicates that scouting for adult flea beetles should begin in the southeast region (1,000 DD). Flea beetles should be collected between 1,200 and 1,600 AGDD. We have not accumulated enough GDD yet in North Dakota for collecting adult leafy spurge flea beetles.

Janet J. Knodel

Extension Entomologist

janet.knodel@ndsu.edu

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