Abstract
Abstract Naturally infested crabapples growing on campus at the Ohio State University Agricultural Research and Development Center near Wooster were selected for evaluating efficacy of insecticides against fall webworm caterpillers. A KWH backpack mistblower operating at 0.5 throttle and aperture setting 3 was used to apply 400 ml of spray to the web and surrounding foliage on each of 3 single-web replicates/treatment. Application of sprays occurred 12 Sep under partly sunny skies at 10-13°C with a breeze of 0-5 km/h when larvae were 15-25 mm long. Treatment effectiveness was evaluated 4, 8, and 15 days posttreatment by dismantling and examining the web in each sprayed tree and counting living and dead larvae.
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