Abstract
Abstract Separate tests were conducted and evaluated for control of the grape phylloxera at Wooster, Ohio. Test 1 (‘Concord’) consisted of 6 treatments applied on 26 Jun, 5 Jul, 18 Jul, and 6 Aug. Test 2 (‘Clinton’) consisted of 4 treatments applied on 7 Jun, 20 Jun, and 2 Jul. Plots consisted of 2 adjacent grape vines, having 4 replications per treatment in randomized blocks. Vine spacing was 2.7 m between rows and 2.4 m within the row. Temik granules (Test 2) were distributed by hand uniformly in the bottom of 5-cm-deep furrows 0.45 m away from each side of the row and immediately covered with soil on 18 May. Soil moisture was good at time of application; granules were not watered-in. Other treatments were applied as foliar sprays using a hand-operated CO2 sprayer operated at 50 psi (3.52 kg/cm2) equipped with a 9505E Tee Jet nozzle. Sprays were applied at the rate of 700 liters/ha. In sampling, 10 shoots were chosen at random from each plot, half from each side of the row. The number of galls was recorded from the 10 apical leaves on each of these shoots.
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