![]() Scientific Name: Spodoptera exigua (Hübner)ĭescription: The caterpillars (larvae) of the beet armyworm are stages most commonly observed when they can occur in high numbers. The ichneumonid wasp ( Hyposoter exiguae) is a parasitoid that lays eggs inside young beet armyworm larvae.Beet armyworm, Spodoptera exigua (Hübner) (Lepidoptera: Noctuidae), caterpillar in cotton boll. Apply row covers on seedlings or transplants in spring for 5-8 weeks to exclude adults from laying eggs on the crop. In southern Utah, tilling the soil at the end of the season will disrupt the beet armyworm’s overwintering pupation stage, which occurs only a few centimeters below the surface. The time of greatest concern is from mid-July through harvest. They feed on foliage, shred leaves, make irregular holes, and in extreme cases, defoliation. Damageįeeding caused by beet armyworm is a concern for a variety of vegetable crops, notably beets. In northern Utah, beet armyworm pupae do not survive the cold winters, so moths are reintroduced each summer from southern locations. Several generations can occur each season. During summer, pupation takes 5-8 days until the adult emergence. When mature, the caterpillar pupates near the soil surface. After 2-5 days, the caterpillars hatch and feed for three weeks. Females lay several hundred eggs, placed singly on the underside of leaves near blossoms and branch tips of woody hosts. In southern Utah, beet armyworms overwinter as pupae, emerging in spring. Larva: 1.25 inches long with light stripes along their sides, and without hairs or spines. Buss, University of Florida) DescriptionĪdult: Moths are gray-brown, with a 1 inch wingspan.Įgg: Ribbed, circular-pointed, and covered by fluff pulled from adult wings. Beet Armyworm (John Capinera, University of Florida, )īeet Armyworm Adult (Lyle J.
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