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European Corn Borer Update (07/16/20)

For the univoltine Z-race European corn borer (ECB) moth, traps catches continue to be fairly high, average of 45 moths per trap per week last week (see trapping map).

For the univoltine Z-race European corn borer (ECB) moth, traps catches continue to be fairly high, average of 45 moths per trap per week last week (see trapping map). Crop stages were V11 to tasseling in southeastern North Dakota. The highest trap catch was 121 moths per trap per week near Buffalo, Cass County and 73 moths per trap per week near Finley, Steele County. The univoltine Z-race ECB moth is about 90% emerged based on the >1274 accumulated degree days (ADD) (see DD map). Weekly maps of the trapping results for European corn borer moths are posted on the IPM website.

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Continue scouting for ECB in non-Bt field corn for hot spots. Please see Crop and Pest Report (Issue 10, 07-09-20) for more information on scouting and the Economic Threshold.

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Janet J. Knodel

Extension Entomologist

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