Chemical Evaluations for Control of Japanese Beetle on Grapes, 1995

In an experimental ‘Clinton’ 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 gpa (935 liter/ha) on 18 Jul. A hand-held CO2 sprayer operating at 45 psi (3.2 kg/cm2), equipped with a 9505-E-TeeJet nozzle, was used to apply treatments. No surfactant was added to any of the treatments. On 18 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, and 6 d after initial treatment and placed in round 1-gal. ice cream 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 cheesecloth over the open top. Beetles were confined in the cages with the treated foliage for 24 h after which the number of dead beetles was determined.