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Second Armyworm Flight Under Way in Southern Illinois

June 8, 2001
Ron Hines, senior research specialist, Dixon Springs Agricultural Center, continues to catch true armyworm moths in southern Illinois. These moths represent migrants from more southern states or the adult stage of armyworms that were recently feeding in pastures, cornfields, or wheat fields of southern Illinois. Following mating, female moths will begin to seek out suitable egg-laying sites. True armyworm eggs are white and deposited in rows or clusters on the lower surfaces of grass leaves. Egg laying occurs during the evening hours. Because armyworms pass through two to three generations each year, pastures will remain at risk to economic infestations for the duration of the summer. Wheat remains at risk up to harvest because of the potential threat of head clipping.

According to the Handbook of Corn Insects, published by the Entomological Society of America, armyworm outbreaks are generally curtailed in warm and dry weather by natural enemies (parasitoids and predators). Unfortunately, for much of Illinois, the weather has been cool and wet. Let's hope we see some sunshine in the near future.--Mike Gray

Author: Mike Gray

The Pest Management and Crop Development Bulletin
Executive Editor: Kevin Steffey, Extension Entomologist

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