Endosulfan and Other Insecticides for Control of the Leaf Form of the Grape Phylloxera1 in Ontario2

Abstract

Endosulfan was effective in several experiments in 1965-67 against Phylloxera vitifoliae (Fitch) attacking the leaves of grape cultivars. Maréchal Foch, 'Seibel 7053', and 'Seibel 5279' in Ontario. It was slightly more effective applied in the postbloom than in the prebloom spray, and less effective when applied soon after the beginning of shoot growth. Lindane also was effective as a summer spray, but dimethoate was not effective. A preliminary leaf-dipping test showed several other insecticides were not promising as foliar treatments. Dormant applications of Morestan® (6-methyl 2,3-quinoxalinedithiol cyclic S,S-dithiocarbonate), Ethion Superior oil, and lime sulfur reduced phylloxera injury to 'Clinton' grapes, but were less effective than summer sprays.