Abstract

Abstract The experimental design was a randomized complete block, with 8 insecticide treatments and a control replicated 5 times. Plots consisted of 4 trees, 1 each of the cultivars York Imperial, Delicious, Golden Delicious, and Rome Beauty. Experimental sprays were applied with a Myers Mity Mist airblast sprayer calibrated to deliver 50 gpa. Spray dates coorresponded to the following phenological stages (cv. Golden Delicious): Half-inch green-18 Apr; Pink-4 May; Petal fall-24 May. A regular fungicide schedule (Cyprex, Benlate, Bayleton, Captan, Zineb, Manzate, Rubigan) was maintained throughout the season. Effect of treatments on WALH was evaluated by counting nymphs on 25 leaves/tree (cv. York Imperial). ERM populations were evaluated by making several counts on random samples of 25 leaves/tree (cv. York Imperial), 125 leaves/treatment. Effectiveness of sprays for RAA was evaluated by examining the entire tree (cvs. Rome Beauty and York Imperial) and determining the number of infested leaves and the number of injured apples/tree. A leaf was considered infested if it contained 1 or more live aphids or showed visible signs of curling. Pest pressure was moderate.

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