Evaluation of Japanese Beetle Adulticides on Grape Foliage, 198

Abstract

Abstract Six insecticide treatments were screened for efficacy against the Japanese beetle on potted 'Seyval' grapes at Wooster, OH. The potted vines were transported from the greenhouse to a sodfield, highly infested with adult beetles just prior to treatment. A treatment consisted of 10 vines, 5 replicates, each containing 2 vines in a randomized block design. A single application was made Jul 8. Two methods of application were utilized, a C0„ constant pressure sprayer and a Herbi Micron ultra low-volume applicator. The CO. sprayer equipped with a TeeJet 9505E fan-type nozzle was operated at 40 psi to deliver 4 of the treatments at the rate of 50 dal/acre. The remaining treatments were applied with the Herbi at the rate of 0.5 gal water/acre. Treatments were evaluated through bioassay at 3 different periods post application. Leaves (2) were removed from treated plants and their petioles were placed in floral tubes. These leaves were in turn placed in 1-gal ice cream cartons with 10 Japanese beetles collected in an untreated area. The cartons had been modified by placing a 16-mesh wire screen over the bottom and cheese cloth over the top. The insect holding room was maintained at 75 F with 80 + 5% RH under a 16-hr photoperiod.