This was the first noted occurrence of this insect in Nebraska this year. He noted that this insect occurs uncommonly in corn in Nebraska, but that it has a wide host range. In May of this year Bob Wright, extension entomologist, reported the occurrence of beet armyworm, Spodoptera exigua, at Clay Center.
This content requires Flash Download the free Flash Player now! var s1 = new SWFObject('','player','250','30','10') s1.addParam('allowfullscreen','true') s1.addParam('allowscriptaccess','always') s1.addParam('flashvars','duration=217&file=') s1.write('Beet_Armyworm') This content requires Flash Download the free Flash Player now! The SLN label is for the use of Intrepid 2F insecticide/insect growth regulator applied by aircraft at the spray volume of 5 gallons per acre to control armyworm in sugarbeets and dry edible beans. Beet armyworms on a sugarbeet leaf showing the webbing that is sometimes associated with infestations.ĪugUpdate: A Special Local Needs label has been issued under Section 24(c) of FIFRA. At night, when it cools, the larvae will climb back up to feed.įigure 5. In the heat of the day beet armyworm larvae may be found at the base or in the crown of the sugarbeet. Note the “windowpane-like” leaf injury caused by the young larvae and the large open holes caused by larger larvae.įigure 4. Feeding damage from beet armyworm on a sugarbeet leaf. Larvae of multiple different stages are often found on the same plant.įigure 3. A late instar beet armyworm larvae with inset (upper right) showing detail of the characteristic black dot behind its head. 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.Figure 1. 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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