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Collect Flea Beetles for Leafy Spurge Control (6/29/17)

To determine when to begin collecting adult Aphthona flea beetles, use the accumulated growing degree days (AGDD) for sunflower (base of 44 F) on NDAWN - sunflower degree days/growth stage application.

Collect Flea Beetles for Leafy Spurge Control

To determine when to begin collecting adult Aphthona flea beetles, use the accumulated growing degree days (AGDD) for sunflower (base of 44 F) on NDAWN - sunflower degree days/growth stage application. Select the “Map” tab, enter “2017-03-01” for planting date and select “growing degree day” for map type.

Currently, most of North Dakota is above 1,200 AGDD using the sunflower GDD model and now is when Aphthona flea beetles should be collected. However, the far northern tier of North Dakota is only at 898 to 1174 AGDD using the sunflower GDD model. (See map below)

Adult flea beetles can be collected easily with sweep nets. After late July (or 1,600 AGDD), flea beetles begin to lay eggs and should not be moved or collected. Leafy spurge flea beetles typically take three to five years to establish and reduce leafy spurge infestations.

To find collecting sites for leafy spurge flea beetle, contact your local county weed office (number listed in local phone book). Leafy spurge flea beetles also are available commercially for purchase at Biological Control of Weeds or WeedBusters BioControl in Montana.

knodel leafy spurge flea beetle map

 

Janet J. Knodel

Extension Entomologist

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