Abstract
Abstract Taxus in 3-gal containers were sprayed on 9 Aug to the point of runoff (1 plant/treatment) witli a 1-gal hand-pump sprayer. Soil drench treatments of 1.0 and 1.5 oz/plant of Metasystox R 2EC were made in 0.5 gal of water on 16 Aug. Plants were kept outside to evaluate the residual effectiveness of insecticides under natural conditions. Black vine weevil adults, which were used in the bioassay tests, wen collected in Jul and Aug from heavily infested properties in Westerville, OH. Weevils were maintained in the laboratory under ambient room condition and fed foliage from wild grape and taxus. Sections (2-3 inches) of treated taxus foliage were placed in Telan petri dishes (3.25 inches diam). A replicati consisted of 8 weevils per petri dish. There were 5 replicates per treatment (40 weevils/treatment). The petri dishes were kept next to a window during the trials to obtain a normal photoperiod for that time of year. There was 0.7 inch of rainfall the day after the plants were sprayed.
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