Abstract
Abstract The experimental design was a randomized complete block, with 4 insecticide treatments and a control replicated 5 times. Plots consisted of 3 trees, one each of the cultivars Yorking, Golden Delicious, and Rome Beauty. The trees were planted at a spacing of 10 × 20 ft. and were 16-yr-old. Experimental sprays were applied with a Myers Mity Mist airblast sprayer calibrated to deliver 50 gal/acre. Calculation of pesticide rates/acre (except Sun 6 E Oil) was based on tree row volume measurements (377,665 ft3/acre). Spray dates corresponded to the following phenological stages (cv Golden Delicious); half-inch green- 7 Apr and pink-25 Apr. A regular fungicide schedule (Dithane M-45 and Nova 40 WP) was maintained throughout the season. Post-bloom insecticides (Guthion, Lannate) were applied at 1- and 2-wk intervals beginning in mid-Jun. Effectiveness of the sprays for rosy apple aphid was evaluated by counting the number of RAA injured clusters/10 min observation/tree and total number of damaged apples per tree (cvs Rome Beauty arid Yorking). Pest pressure was very heavy.
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