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Oriental armyworm
Larvae of fall armyworms vary from light tan to nearly black with a distinct white line between the eyes that forms an inverted “Y” pattern on the face. Another identifying characteristic are three thin light-yellow lines that run from head to tail of the larvae.
At first, fall armyworms are very small – 1/8 inch long – and cause little plant damage. An early sign of fall armyworms is “window-pane” feeding, where the green tissue has been scraped off, leaving a clear membrane.
Larvae feed for 2-3 weeks, and full-grown larvae are about 1 to 1-1/2 inches long and may eat small plants to the ground, causing a severe stand loss in just a couple of days. Given their immense appetite, great numbers and marching ability, fall armyworms can damage entire wheat fields in a few days.