Larvicidal Evaluation for the Control of Endopiza Viteana, 1985

Two blocks of a 19-year-old experimental vineyard at Wooster, OH were used. Cultivars utilized were ‘Clinton’ in Test 1 and ‘Concord’ in Test 2. Plots consisted of a single vine with 4 replications per treatment in a randomized block design. Insecticidal applications for test were made on 4 and 21 Jun, 10 Jul, and 13 Aug. Test 2 treatments were applied on 6 and 25 Jun and 10 and 27 Jul. All applications were made at the rate of 757 L/ha (200 gal/acre) using a hand-held constant pressure CO2 sprayer operating at 3.2 kg/cm2 (45 lb/in2) and equipped with a 9505-E-TeeJet nozzle. On 20 Sept Test 1 and 23 Sept (Test 2), 10 clusters of grapes were randomly harvested from each replicate, and the number of stung berries was recorded for each cluster.