1990 Trials of Nonconventional Insecticides for Control of the Eastern Grape Leafhopper

Abstract Five materials acceptable to organic growers were compared with the standard treatment of carbaryl. Trials were carried out in 2 mature Concord Vineyards, one in Fredonia, NY, on Lake Erie, and one in Penn Yan, NY, in the Finger Lakes region. At both vineyards, the rows were 9 ft apart with the vines set at 8 ft within the row. Each treatment consisted of 1 vine, and was replicated 4 times in a randomized complete block design, where each row was a block. Treatments were applied with a backpack sprayer (Solo 425; Solo, Inc. Newport News, VA) equipped with a pressure gauge, with the pressure maintained at 30 psi. Two control treatments were used: Water only was applied in one treatment and no spray was applied to the second treatment. Counts of EGLH nymphs on leaves 3-7 (numbered from basal node) were made on 3 shoots in each treatment at the time of treatment and again on the same shoots at 7 days post-treatment. Mean number of EGLH nymphs per shoot were calculated, and statistically separated using Fishers protected LSD test.

Trials of Nonconventional Insecticides for Control of the Eastern Grape Leafhopper, 1990 Academic Article