Abstract
Abstract The experimental design was a randomized complete block, with 4 insecticide treatments and a control replicated 4 times. Plots consisted of 3 trees, one each of cultivars 'Yorking', 'Golden Delicious', and 'Rome Beauty'. Test trees were planted at a spacing of 20 × 20 ft and were 18-yrs-old. Experimental sprays were applied with a Myers Mity Mist airblast sprayer calibrated to deliver 100 gpa. The first three treatments were applied at half-inch green stage (8 Apr) and the Cygon treatment was applied at pink stage (17 Apr) of'Golden Delicious' development. A regular fungicide schedule (Benlate, Captan, Nova, and Thiram) was maintained throughout the season. Post-bloom insecticides (Guthion, Lannate) were applied at 1- to 2-week intervals beginning at petal-fall in early May. A cleanup spray of Diazinon, Swat, and Tween-20 was applied after injured clusters were counted on 29 May and another application of Swat was applied on 7 Jun. Effectiveness of sprays for RAA was evaluated by counting RAA injured clusters/tree in a 10 minute sample and total number of damaged apples per tree ('Rome Beauty' and 'Yorking'). WALH density was evaluated by counting nymphs/25 injured leaves.
Sign-in/Register to access full text options 
Free) 
Talk to us
Join us for a 30 min session where you can share your feedback and ask us any queries you have
Schedule a call
