Vegetative and Fruiting Responses of Grapes to Chlorsulfuron and Oryzalin

Abstract Chlorsulfuron was applied alone at 0.018 kg·ha −1 and in combination with 3.4 kg·ha −1 of oryzalin at rates of 0.018, 0.035, 0.070, and 0.140 kg·ha −1 to a mature ‘Chancellor’ grape ( Vitis × sp.) vineyard. Oryzalin was also applied alone at 3.4 kg·ha −1 . Oryzalin plus chlorsulfuron treatments provided excellent weed control. The vegetative growth of vines was reduced in the oryzalin plus chlorsulfuron treatments at rates of 0.07 and 0.14 kg·ha −1 as compared to the control. Oryzalin used alone and oryzalin plus chlorsulfuron used at the lowest rate were the only treatments that did not adversely affect vine growth or fruit quality. Chemical names used: 2-chloro-N-[[(4-≎ methoxy-6-methyl-1,3,5-triazin-2-yl)amino]carbonyl]benzenesulfonamide (chlor-sul-≎ furon); 4-(dipropylamino)-3,5-dinitrobenzenesulfonamide (oryzalin).