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European Corn Borer Emerging (07/02/20)

Thanks to the support of the North Dakota Corn Council, we are monitoring a trapping network for flights of European corn borer (ECB) in conventional non-Bt corn fields again in 2020.

Thanks to the support of the North Dakota Corn Council, we are monitoring a trapping network for flights of European corn borer (ECB) in conventional non-Bt corn fields again in 2020. We have 11 trap sites in 8 counties of ND including Barnes, Cass, Grand Forks, Ransom, Richland, Sargent, Steele, and Ward Counties. The Z-race ECB is just starting to emerge in V6 to V8 field corn, except in Barnes and Grand Forks Counties. This is the univoltine flight (one flight per year) of ECB, which emerges in July. We will be posting weekly maps of the trapping results for European corn borer moths on the IPM website.

A degree day model has been developed to forecast the emergence of the univoltine ECB moths (Table 1). Go to the NDAWN, select Applications, and then select ‘Insect DD’ and the nearest town; or select ‘map’ for the whole state North Dakota and the base temperature of ‘50 F’. As you can see, the southeastern area of North Dakota has accumulated 800-980 degree days (see map below), which indicates that the univoltine ECB moths are 10-25% emerged.

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Janet J. Knodel

Extension Entomologist

This site is supported in part by the Crop Protection and Pest Management Program [grant no. 2017-70006-27144/accession 1013592] from the USDA National Institute of Food and Agriculture. Any opinions, findings, conclusions, or recommendations expressed are those of the website author(s) and do not necessarily reflect the view of the U.S. Department of Agriculture.

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