Abstract
Abstract Late instar fall webworm larvae were collected from native populations feeding on choke cherry, Prunus virginiana. Larvae were divided into groups of 100 in Petri dishes each containing 5 larvae. Insecticide treatments were made 28 Aug to a shelter-belt planting of cottonwood using a CO2 compressed air sprayer until point of run-off After spray deposits had dried, leaves were collected, cut into smaller pieces, mixed, and fed to larvae. Mortality of larvae was checked 24 and 72 h after exposure to treated foliage.
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