Abstract
Abstract These tests were conducted in 2 established Concord grape vineyards in North East, PA. Plots consisted of 3 vines in a row replicated 4 times in a randomized block designed at both study sites. Vine spacing was 9 ft between rows and 8 ft within rows. One spray was applied in each test using a small plot R&D sprayer with a single 80° LF nozzle at 30 psi. operating pressure. Spray volume was 40 gal per acre. Evaluations consisted of counting the number of leafhopper nymphs on each of 10 randomly selected damaged leaves within each plot.
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