During the week of June 10-16, I was catching nearly 100 armyworm adults a night in my blacklight trap in Ames. These large trap catches suggest that the armyworm population is very high, at least in central Iowa, and maybe elsewhere in the state because I received reports of "corn borer-like moths" from southwestern and western Iowa. These large moth flights should serve as an early warning of potential armyworm problems. Armyworm moths are about twice the size of European corn borer adults, and they have a small, white dot in the center of each forewing.
Iowa State University
Rice, Marlin E., "Armyworms could be a problem in no-till corn" (2007). Integrated Crop Management News. 1064.
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