CHEMICAL EVALUATIONS FOR CONTROL OF JAPANESE BEETLE ON GRAPES, 2010:

Abstract

Treatments were evaluated for efficacy against the Japanese beetle in an experimental 'Concord' vineyard at Wooster, Ohio. Plots consisted of two grape vines, with 4 replications per treatment in a randomized block design. Treatments were applied as foliar sprays at a rate of 100 gal/acre (935 liter/ha) on 29 Jun. A hand-held CO2 sprayer operating at 45 psi (3.2 kg/cm) and equipped with a 9505-E-TeeJet nozzle was used to apply treatments. A non-ionic surfactant was added to all treatments at the rate of 0.125 vol/vol. The number of JB present within each treatment plot was recorded prior to treatment applications. Subsequent counts were taken at 1, 3, 7, and 13 DAT. In addition to the number of beetles present in each treatment a rating of the percent foliar damage was taken on 13 DAT. This was accomplished by observing damage on the five fully developed terminal leaves on 10 shoots in each treatment replicate and assigning a percentage based on the number of leaves damaged.