![]() Yellow-striped armyworms have natural enemies in the field including parasitic wasps and flies. Larger yellow-striped armyworm larvae feed in tomato fruit. Insecticides listed for corn earworm are generally effective against small larvae while those listed for beet armyworm may be more effective against larger stages.įigure 3. Therefore, transplanted crops and young plants should be monitored regularly for early detection of yellow-striped armyworm. ManagementĪs with other armyworm species, it is much easier to control small larvae as larger stages are more tolerant of some insecticides. Young yellow-striped armyworm larvae feeding on tomato foliage. There are three to four generations during the year in Kentucky with the mid-summer generations being more common.įigure 2. Eggs hatch in 5 to 7 days and the larvae feed for about 3 weeks before returning to the soil to pupate. A single female may deposit more than 2000 eggs. The female moth lays her eggs in clusters of 200 to 500 on the undersides of leaves. ![]() Yellow-striped armyworm overwinters as a pupa in the soil and emerges as a moth in April and May. The larva can reach 1-3/4 inches in length. There is an inverted white ‘Y’ on the dark head capsule with a netlike pattern. There may be a noticeable dark spot above and behind the hind legs, but this can be difficult to see on darker larvae. Two dark triangles may be apparent on the top of each segment. Below this yellow stripe there are other less distinct stripes including a pink stripe above the prolegs. The body varies from dark grey to black in color with two prominent yellow stripes along each side. The larva can be common in some years and is distinct in appearance. Yellow-striped armyworm is a very common vegetable insect pest. While it is primarily a foliage feeder and can seriously injury young plants in the early season, later in the season it will also feed in the surface of tomato and pepper fruits as well as foliage.įigure 1. It also attacks tobacco, soybeans, corn, and alfalfa. Yellow-striped armyworm is a common pest of many vegetable crops in Kentucky including greens, tomatoes, peppers, beans, cucurbits and cole crops. ![]() University of Kentucky College of Agriculture ENTFACT-321: Yellowstriped Armyworm | Download PDF Ric Bessin, Extension Specialist ![]()
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