 Immature larva of bertha armyworm Bertha Armyworm Mature caterpillars are about 30 mm long, dark on top, and have a yellow-orange stripe on the side and mottled gray or green on the bottom. Young larvae may be green, brown, or black with a light brown or tan head capsule. There is no white “Y” on the front of the head. Adults are brown “miller” moths. Larvae feed on leaves and defoliate plants. The larvae are often found feeding on crops and weeds in late summer or early fall during the daytime. Host plants: rape, legumes, sugarbeets, hops, cabbage, corn, peas, beans.
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