Abstract
Abstract These tests were conducted in an established Concord grape vineyard in North East, PA. Plots consisted of 3 vines in a row replicated 4 times in a randomized block design. Vine spacing was 9 ft between rows and 8 ft within rows. One spray was applied in each test using a 6-gal, True-test plant sprayer operated off a high pressure hose of a Myers 61256ET2 hydraulic vineyard sprayer. Operating pressure was 100 lb/in2. Sprays were applied to runoff resulting in 100 gal of spray per acre. Triton AG-98 was the spreader sticker used at the rate of 2 oz per 100 gal. The treatments were evaluated by counting the number of leafhopper nymphs on each of 10 injured leaves selected at random per plot.
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