Weed Control in Young Vineyards

Abstract

Four combinations of preemergence and postemergence herbicides (diuron plus dalapon, diuron plus terbacil, simazine plus amitrole, and dichlobenil plus amitrole) were compared with paraquat on a newly set vineyard in 1967. All herbicides gave some degree of weed control but only paraquat was not phytotoxic to the newly set vines. Nitralin, nitrofen, simazine, dichlobenil, all at 4 pounds per acre, and paraquat at 0.5 pound provided significant weed control without toxicity to vines from 1968 to 1970 in this same planting. Vines generally had better vigor and yield where herbicides were applied than where not applied, but the differences were not significant.