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European Corn Borer Trap Update (07/26/18)

Trap catches of the univoltine Iowa (or Z-race) of European corn borer (ECB) decreased this past week.

European Corn Borer Trap Update

Trap catches of the univoltine Iowa (or Z-race) of European corn borer (ECB) decreased this past week. Univoltine ECBs were captured in only 3 of the 10 trap sites in eastern ND. Last week probably was the peak emergence for the univoltine ECB. Field reports indicate that egg masses and young larvae are present in field corn in SE ND. Therefore, scouting in conventional field corn for egg masses and larvae number is critical now. If ECB populations are above thresholds, an insecticide will need to be applied; however, insecticides only provide about 75-80% control of ECB. Field scouting and trapping can help with proper timing of insecticide applications. Insecticide need be applied before the 3rd instar ECB larva (length of larva is about the size of a dime) bores into the stalk, about 7-10 days after egg hatch, depending on temperatures. See last week’s Crop & Pest Report article for ECB scouting and threshold. Maps of the ECB trapping results are posted weekly on the IPM website.

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Janet J. Knodel

Extension Entomologist

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