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Collect Leafy Spurge Flea Beetles (07/01/21)


The accumulated growing degree days (AGDD) for sunflower (base of 44 F) are used as a guide to determine when to begin collecting for adult flea beetles. Flea beetles should be collected between 1,200 and 1,600 AGDD using the sunflower GDD model from NDAWN. Adult flea beetles can be collected with sweep nets. Due to the warmer than normal spring, emergence of leafy spurge flea beetles will be earlier this year. Most areas of North Dakota have accumulated enough growing degree days (GDD) for collecting for adult leafy spurge flea beetles. Use the sunflower degree days/growth stage application on NDAWN website. Enter “2021-03-01” for the planting date and select “degree day” for map type.

Please see last week’s article in the Crop & Pest Report #9 (June 24, 2021) for more information.


Janet J. Knodel

Extension Entomologist