Abstract
Abstract Treatments were evaluated for efficacy against the Japanese beetle in an experimental ‘Concord’ grape 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 liter/ha) on 6 Jul, and 20 Jul, using a hand-held CO2 sprayer operating at 45 psi (3.2 kg/cm2) and equipped with a 9505-E-TeeJet nozzle. No surfactant was added to any of the treatments. On 20 Jul 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, 3,6,8, 10, 13, and 16 days after initial treatment and placed in round 1 -gal. ice cream containers along with 10 Japanese beetle adults. The ] -gal. containers were modified by placing plastic liners inside and cheese cloth over the open 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 ca. 75% RH.
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