Abstract
Abstract Efficacy of insecticides for control of black vine weevil adults was evaluated by spraying field plants.and feeding treated foliage to weevils in the laboratory. A CO2 compression sprayer operating at 40 lb/in2 with a TeeJet SS 8004 flat fan nozzle was used to spray plants to runoff on 19 Jul. under sunny skies at 26°C and an 8 to 16 kph breeze. Three plants 0.6 m tall were sprayed with each treatment. Subsequently, at 1, 3, and 7 days posttreatment, 10 to 15-cm twigs were clipped from treated plants and placed individually in 9 by 16 cm cylindrical paper cartons fitted with nylon mesh tops. Three cartons (= replicates) were used for each treatment, each with five ovipositing weevils. Weevils had been collected previously from a nursery in Lake Co. and held at 22°C at 90% RH with taxus foliage until used in this test. Weevil mortality was recorded 72 h after they were introduced to the cartons.
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