Abstract
Abstract The experiment was conducted in a mature vineyard at the Erie County Field Research Laboratory in North East, PA. Treatments were applied to Concord grapes trained to the single curtain (no tie) system. Treatments consisted of 6-vine plots arranged in a randomized complete block design and replicated 4 times. Each treatment row was separated by 2 untreated buffer rows. Applications were made using a Friend, small plot sprayer equipped with an FMC, vineyard boom. Treatments were applied at 100 gal/acre with pressure adjusted to 100 psi. The treatments were applied on Aug. Nova 40 W was applied to the treatment areas on 10 Jun at 3 oz/acre and 28 Jul and 18 Aug at 4 oz/acre to control black rot and powdery mildew. Precipitation for May, Jun, Jul, Aug, Sep and Oct was 1.63, 2.10, 3.09, 4.62, 6.62 and 3.22 inches, respectively. A pretreatment count of leafhopper nymphs was taken on 17 Aug. Posttreatment evaluations were conducted 8, 14, and 20 days after application. Evaluations consisted of randomly selecting 20 injured leaves per plot (pretreatment) and 10 injured leaves per plot (posttreatment) and recording the number of leafhopper nymphs. Berry samples for determining degrees Brix were collected on 5 Nov. The apical portion from each of 10 basal clusters were collected from the center of each plot.
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