Grape Phylloxera, Subsurface and Foliar Insecticide Applications in Ohio, 1978

Abstract

Abstract Ten insecticides were evaluated for control of grape phylloxera at Wooster. Plots consisted of 2 Clinton vines, with 4 replications per treatment in randomized blocks. Vine spacing was 9 ft between rows and 8 ft in the row. Granular formulations were applied on June 28 and incorporated in the soil 1.5 ft away from vine rows and 1.5 ft outside end vines, in the form of an ellipse around the plot. Granules were distributed uniformly in the bottom of a 1.5-inch furrow and covered with soil as soon as applied. Soil moisture was good at time of application, so granular treatments were not watered-in. Foliar treatments were made on June 28 and July 11, using a hand-opdrated CO2 sprayer operated at 60 psi and equipped with a Tee Jet® D2 disc and No. 25 core. Sprays were applied to vines at the rate of 100 gal/acre. A spreader-sticker, Ortho X-77, was added to all sprays, except Zolone, at 1 pt/100 gal. In sampling, 10 shoots were chosen at random from each plot, half from each side of the row. The number of galls were recorded from the 10 apical leaves on each of these shoots. Fungicides were applied to the entire experimental area on Jun 2, 27, and Jul 6 at the following ai rates: Captan 1.5 lb and Benlate 0.5 lb + 1 pt Ortho X-77/100 gal. Rainfall from first application to last gall survey totaled 2.85 inches.