Abstract
Abstract Five treatments were evaluated for efficacy against the Japanese beetle and grape berry moth in an experimental Concord grape vineyard at Wooster, Ohio. Plots consisted of 2 grape vines, with 4 replications/treatment in a randomized block design. Treatments were applied as foliar sprays at a rate of 100 gal/acre (935 l/ha) on 13 Jun, 23 Jul and 8 Aug, using a hand held CO2 sprayer operating at 45 psi (3.2 kg/cm2) and equipped with a 9505-E-TeeJet nozzle. After treated foliage was dry, 10 grape leaves were removed from the outside canopy of each plot for use in the bioassay. Leaves were brought into the lab on 0, 1, and 6 DAT and placed inside 1 gal ice cream containers along with 10 Japanese beetles. The 1 gal containers were modified by placing plastic liners inside and cheese cloth over the top. After holding beetles on treated foliage for 24 h, a count of the number of dead beetles was taken. The insect holding room was maintained at 75°F (23°C) with 75% RH. On 12 Sep, 10 grape clusters were randomly removed from each replicate and examined for the number of berries infested by grape berry moth.
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