Abstract
Abstract The experiment was 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. Sprays were applied on Jun 24, Jul 9, and Aug 14 using an Ortho garden sprayer operated off a high pressure hose of a Meyers 61256ET2 hydraulic vineyard sprayer, peratin pressure was 100 psi. Sprays were applied to runoff resulting in approximately 200 gal of spray per acre. Spray water was adjusted from a pH of 7.40 to pH 6.65 using Miller Spray Aide (4 oz/100 gal). Triton AG-98 (2 oz/100 gal) was used as a spreader sticker. Treatments were evaluated by counting the number of leafhopper nymphs on each of 10 injured leaves selected at random per plot. Fifty clusters per plot were randomly selected and examined for grape berry moth larval injury. Fifty leaves were selected at radom per plot and the number of Japanese beetles recorded from the time of first beetle appearance until natural population decline. A modified Horsfall-Barratt scheme was used to rate leafhopper injury on Sep 30, by examining 25 leaves atrandom per plot.
Published Version (
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