Beet armyworm is a serious pest of vegetables in Kentucky, often appearing in August or September. Adults have siphoning mouths. Female moths lay masses of up to 80 eggs under a covering of cottony-white scales, as many as 600 eggs over a three- to seven-day period. Young larvae feed gregariously and skeletonize foliage. Photo by A. Knutson. Development time, from egg to adult, is about 40 days. They may spin a light web over the foliage. Purchasing high quality insect eggs or larvae from Frontier will prove to be a reliable and cost effective alternative. Yellowstriped Armyworm – These have two large and many smaller yellow stripes. Both beet armyworm (Figs. Mature larvae are about 1½ inch long and can rapidly defoliate plants. The beet armyworm, Spodoptera exigua (Hübner) (Lepidoptera: Noctuidae), is a widely distributed polyphagous pest .In China it seriously damages many cultivated crops including cabbage, cowpea, soybean, onion, cotton and others , , insecticide application is the most practical way to prevent its damages, however, many insecticides have been reported to fail to control … Photograph courtesy of Alton N. Sparks, Jr., Caterpillars hatch 5-8 days after. They can eat tender young transplants to the ground and defoliate older plants. The beet armyworm is a light-green to black larva with four pairs of abdominal prolegs and a dark head. Cylindrical and greenish to white in color. When infestations become dense and crowded, larvae migrate together from field to field; sugar beets adjoining infested alfalfa hay fields or cereals may be completely defoliated by migrating armyworms. Description: The caterpillars (larvae) of the beet armyworm are stages most commonly observed when they can occur in high numbers. Please contact us for more information. Photograph by John Capinera, University of Florida. Genus and species: Spodoptera exigua (Hübner). The beet armyworm has an extremely wide host range including mums, marigolds, carnations, and roses as well as vegetables, cotton and soybeans. Beet Armyworm: Spodoptera exigua • Although the beet armyworm is attacked by numerous natural enemies, they usually do not cause mortality soon enough to prevent crop injury. However, it does not survive the winter in areas where its host plants freeze. Beet armyworms are dull green caterpillars with a dark, broad stripe along each side and many smaller, light wavy lines down the back. the plant, much on leaves rather than flowers and seeds. Adult beet armyworms are small, mottled-gray or dusky-winged moths. 1. Beet armyworms are green caterpillars that feed on a wide range of ornamental and vegetable plants. The life cycle can be completed in as few as 24 days, and six generations have been reared during five months of summer weather in Florida (Wilson 1934). Beet armyworm larvae are light to dark green with dark and light stripes running the length of the body and a … Adults emerge in 6­–7 days in warm weather and live for only about 10 days. Females deposit eggs in scaly clusters of 50–150, usually on undersides of leaves. Click for a hub of Extension resources related to the current COVID-19 situation. The beet armyworm is a light-green to black larva with four pairs of abdominal prolegs and a dark head. Please contact us for more information. Newly hatched armyworms are often green and feed in groups, skeletonizing the undersides … Pest Status: Caterpillars feed on foliage on a wide variety of agronomic and horticultural crops and cause severe crop losses when they occur in large numbers; medically harmless. In early-season infestations, the larvae feed on leaves and terminal areas (Fig. Although coloration can be quite variable, the caterpillars are typically pale green with darker, lateral, longitudinal stripes, and they often have a diagnostic small dark spot behind the head laterally, above the second pair of true legs. Adults lay eggs in the spring in a nest of finely woven hairs. Seasonal activity varies considerably according to climate. When infestations become dense and crowded, larvae migrate together from field to field; sugar beets adjoining infested alfalfa hay fields or cereals may be completely defoliated by migrating armyworms. Alias: Beet Armyworm. They are a pest in cotton fields, with young larvae skeletonizing leaves and older larvae feeding in foliage, squares, flowers, and bolls. Many fine, white wavy lines run along the back, and a broader stripe occurs along each side. Identifying Beet Armyworm Damage. Fall armyworm larvae are green, brown or black and have a very distinctive white line between the eyes that form an inverted “Y” on the head capsule. It is native to Asia, but has been introduced worldwide and is now found almost anywhere its many host crops are grown. Beet armyworm can winter in warm areas, such as Florida, Texas, and Arizona, where all life stages can be found year round. Insecticide applications are most effective if applied against small larvae. The voracious larvae are the main culprits. Hatching cluster of beet armyworm eggs. Beet armyworm should be managed to keep the larval population from exceeding this level in the field. Insects Associated with Vegetable Crops in Georgia: Solanaceous Crops Adult moths have a wingspan of 1 to 1 1/4 inches. The most important species of parasitic wasps observed attacking larvae include Meteorus autographae, Cotesia marginiventris and Chelonus insularis . This might be due to use of minimal tillage in nearby soybean fields. Life History- The beet armyworm has several generations per year. In Arkansas, several generations occur annually. The beet armyworm or small mottled willow moth (Spodoptera exigua) is one of the best-known agricultural pest insects. There are many fine, white wavy lines along the back and a broader stripe along each side. Young beet armyworms web foliage together and feed within this shelter. Beet armyworm and cabbage looper are the most common rind feeders in Florida, but cutworms, tobacco budworms, corn earworms, and other armyworms can also be found feeding on the outside of melons. 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