Yellow-striped armyworm on tomatoīlister beetles have been reported feeding and defoliating swiss chard, eggplant and other vegetables. In the field yellow-striped armyworms have natural enemies, which include parasitic wasps and Tachinid flies, although these natural enemies are less commonly found in high tunnels.įigure 1. For organic growers Bacillus thuringiensis (Bt) works well for small larvae control while Spinosad tends to work better on larger larvae. Larger larvae will be more difficult to control and often require the aforementioned pesticides be applied at high rates with high gallonages of spray material. In tomato, small yellow-striped armyworm larvae can be managed with several insecticides including Lannate, Pyrethroids, Radiant, Confirm, Avant, Coragen and Exirel. Transplanted crops, young plants and fruit bearing vegetables, especially tomatoes in high tunnels, should be observed regularly for early detection of yellow-striped armyworm. It is easier to control small larvae vs large larvae as large larvae are more tolerant of several insecticides. Most of its damage is caused by defoliation of a plant, but later in the season larvae often will feed on the outer surface of vegetables scarring them badly making them unmarketable (Fig. It will also feed on several of our more common weed species such as: dock, horse nettle, jimsonweed, lambsquarters, morning glory and redroot pigweed. It will feed on asparagus, bean, beet, cabbage, carrot, cucumber, lettuce, onion, pea, rhubarb, sweet potato, tomato, turnip, and watermelon and will also feed on blackberry, clover, grape, peach, raspberry, soybean, sweet clover and sunflower. Yellow-striped armyworm is a general feeder and will consume large quantities of foliage. There are three to four generations during the year in the mid-Atlantic with the late-summer generation being the most common. Eggs hatch in 5 to 7 days and the larvae feed for about 3 weeks before moving 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. And there is a dark spot just behind the true legs. 1), although this is difficult to see in the dark form.
There are two dark triangle-shaped marks on the top of the yellow stripe on each segment (Fig. Below this yellow stripe there often is one pink or orange stripe running along the length of the worm. Yellow-striped armyworm larvae vary from dark grey to black with two conspicuous yellow stripes along each side of its body (Fig. This is not too unusual as both of these pests tend to become more of a problem later on in the season – late summer/early fall. and yellow-striped armyworm Spodoptera ornithogalli feeding on various vegetable crops in our area. Jerry Brust, IPM Vegetable Specialist, University of Maryland have been several reports and sightings of blister beetles Epicauta spp.
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