Sarah Koerte is a post doctoral research fellow in Dr. Understanding the chemical ecology of the true armyworm will help develop naturally-derived agents and control this agronomical pest insect.ĭr. During these mass infestations their caterpillars cause considerable economical damage to cereal and forage crops such as barley, oats, corn, and alfalfa. In the southern part of Europe, 2-3 generations develop during the growing season, in Central Asia – up to 6-7, in subtropical and tropical climates – up to 10 generations per year.Throughout North America the true armyworm ( Mythimna unipuncta) occurs in sporadic large outbreaks. Pupal development lasts from 7 to 28 days.įeatures of development. The caterpillars pupate in the soil at a depth of 3-5 cm. Young caterpillars concentrate on weeds, older ones switch to cultivated plants. The development of caterpillars lasts 14-28 days. First they skeletonize the leaves, later they make holes in them. After hatching, the caterpillars immediately start feeding. The duration of development depends on the ambient temperature. Place the females in a pile on the underside of the leaves.Įgg. Eggs are laid in three or four piles, up to 250 pieces each. ![]() First - generation butterflies are the most prolific. Fecundity varies from 300 to 1700 eggs, sometimes more than 2000. Females start laying eggs 1-3 days after the flight. Butterfly flight is observed from May to the end of October. It feeds on cotton, alfalfa, sugar beet, corn, tobacco, peanuts, sesame, soy, tomatoes, potatoes, peas, turnips, eggplants, watermelons, clover, sainfoin, young citrus, apple, quince, grapes, oak plantings, elms, yellow acacia, chrysanthemums, tea. The list of forage plants includes 185 species from 50 families.
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