Chemical Evaluations for Control of Japanese Beetle on Grapes, 1994

Abstract

Abstract Treatments were evaluated for efficacy against the Japanese beetle in an experimental ‘Concord’ vineyard at Wooster, Ohio. Plots consisted of 2 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 liters/ha) on 13 and 27 Jul. A hand-held COz sprayer operating at 45 psi (3.2 kg/cm2) and equipped with a 9505-E-TeeJet nozzle was used to apply treatments. No surfactant was added to any of the treatments. On 27 Jul, after treated foliage was dry, 5 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, 3, 6, and 8 days after initial treatment and placed in round 1-gal cardboard containers along with 10 Japanese beetles. The beetles used in these studies were collected in traps in an untreated area. The 1-gal containers were modified by placing plastic liners inside and cheese cloth over the open top. After allowing beetles to feed 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 ca. 65% RH. No phytotoxicity was observed in these studies.