Download beet armyworm9/11/2023 Monitoring is a crucial step in the management process. The adults are short lived and die nine or 10 days after emerging. Mating begins soon after they emerge, and egg laying happens two to three days later, over the course of three to seven days. The adults are nocturnal, doing most of their mating and egg laying at night. They pupate about half an inch deep in the soil, in chambers made of soil particles glued together with a sticky secretion that hardens when it’s dry.Īdults may emerge in six to seven days, but pupating is often the overwintering stage. Each instar stage takes two to three days to complete. The eggs hatch within two to three days during periods of warm weather and go through five, or sometimes more, instars. The hindwings, which are only visible when they’re flying and tucked out of sight when at rest, are light gray or white with dark margins.Įach female produces 300 to 600 eggs, and lays them in clusters of 50 to 150 on leaf undersides, near flowers, and on branch tips. Their forewings are mottled gray and brown, with an irregular banded pattern and a characteristic light-colored, bean-shaped spot. The adults are moths with a one-inch wingspan. Larval feeding can stunt or kill seedlings and young plants. They chew large, irregularly shaped holes in the leaves, plus they will burrow into the crowns and buds of plants. More mature larvae prefer the growing tips of foliage and feed solo, but they can also cause significant damage. They often create light webbing between the foliage, sticking leaves together as well. Young larvae feed in groups and can skeletonize leaves. They like weeds too, such as lamb’s-quarter, mullein, pigweed, and purslane.īoth the adults and larvae feed on the plants, but the larvae are the main concern. Their host range is wide, including a variety of vegetable, field, and flower crops.Īsparagus, beets, cabbage, chrysanthemums, corn, onions, peas, peppers, tomatoes, and turnips are just a few of their favorites.
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