Abstract
Abstract The experimental design was a randomized complete block, with 7 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 corresponded to the following phenological stages (cv. Golden Delicious): half-inch green -11 Apr; Pink -18 Apr. A regular fungicide schedule (Cyprex, Benlate, Bayleton, Captan, Zineb, Manzate) was maintained throughout the season. The effect of the treatments on WALH was evaluated by counting nymphs on 25 leaves per tree (cv. York Imperial). ERM populations were evaluated by collecting a random sample of 20 leaves per tree (cv. York Imperial), 100 leaves per treatment, brushing them with a Henderson-McBurnie mite brushing machine. Effectiveness of sprays for RAA was evaluated by examining entire trees (cvs. Rome Beauty and York Imperial) and determining the total number of infested leaves and the number of injured apples per tree. A leaf was considered infested if it contained one or more live aphids or showed visible signs of curling. Pest pressure was moderate.
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