Western yellowstriped armyworm larva and adult

Western Yellowstriped Armyworm Larva

.Western Yellowstriped Armyworm Adult

2000. Ralph E. Berry, Department of Entomology, Oregon State Univ., Corvallis, OR.

Western yellowstriped armyworm larvae, Spodoptera praefica (Lepidoptera: Noctuidae), feed on potato foliage and are often aggregated on a few plants where complete defoliation may occur. Mature larvae are about 40 mm long and adults have a wing span of 35 to 40 mm. Larvae feed on foliage during late May, June and early July then pupate in the soil. Adults are active from mid-August to mid-September. This pest does not occur in damaging numbers every season and is seldom a serious pest on potato.

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