It is regarded as a pest and can damage and destroy a wide variety of crops, which causes large economic damage. The term "armyworm" can refer to several species, often describing the large-scale invasive behavior of the species' larval stage. Synthetic insecticide options include those with active ingredients such as zeta-cypermethrin, permethrin, lambda-cyhalothrin, esfenvalerate, deltamethrin, cyfluthrin, bifenthrin, and carbaryl.The fall armyworm ( Spodoptera frugiperda) is a species in the order Lepidoptera and one of the species of the fall armyworm moths distinguished by their larval life stage.Organic insecticide options include those with active ingredients such as Bacillus thuringiensis (Bt), spinosad, pyrethrins, and horticultural oils.Many predators, parasites, and diseases attack armyworms, but because armyworms dwell beneath the soil surface, few of these natural enemies are effective in controlling their populations.Fall tillage can also help destroy or expose overwintering pupae. Thoroughly till crop residues and control weeds to reduce armyworm overwintering and feeding sites.Keep crop area weed-free (especially grassy weeds).GENERAL MANAGEMENTĬonsider management for corn seedlings, if 25% of plants show damage and live larvae are still present. In dense, crowded populations, armyworms migrate and may completely defoliate crops. Maturing larvae disperse and move towards the center of the plant, or may be seen in the soil.Ĭorn may be regularly attacked while other vegetables are only occasionally attacked depending on the armyworm species and host plant.Young larvae are found near the egg mass, or in groups on host plants.Eggs are found on leaves of crops or weeds.Monitor adults (fall and beet armyworms) with pheromone traps, starting in June.BIOLOGYĮgg | Larva (6-9 stages) | Pupa | Adult (moth)Īrmyworms are primarily a concern mid-July through September. Depending on the species, larvae vary in color from tan, green, and almost black. DESCRIPTIONĪdults are mottled gray and brown moths with light-colored markings. Larvae may tunnel into corn ears, bore into the head of leafy vegetables, and chew into stems, flower buds, and sometimes upper plant roots. Larvae feed on leaves with chewing mouthparts, causing skeletonized foliage, irregular holes, shredded leaves, or defoliation. Western Yellowstriped Armyworm (Spodoptera praefica).Armyworms can cause severe damage during outbreak period.Įxamples of common armyworm species found in Utah include: These insects belong to a large group of night-flying moths in the family Noctuidae.
Extensive Armyworm Feeding on Squash Foliage HOSTSĪrmyworms can be found all over the United States, with various species found in Utah.
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