TOMATO (LYCOPERSICON-ESCULENTUM) CULTIVAR AND WEED SENSITIVITY TO DPX-E9636

Sensitivity of 49 tomato cultivars and four weeds to DPX-E9636 was det ermined in greenhouse experiments. Cultivar tolerance varied from comp letely tolerant to intolerant. The most efficacious application method in greenhouse experiments was early POST for the weeds tested (yellow nutsedge, prostrate eclipta, and paraquat-resistant and -sensitive Am erican black nightshade). Paraquat-resistant American black nightshade was 123 times more sensitive to DPX-E9636 than the paraquat-sensitive biotype. Under field conditions and at 0, 36, or 72 g ai/ha applied o ne week after transplanting, tomato cultivars showed no response to DP X-E9636 in visual vigor ratings 3 wk treatment, or in shoot fresh or d ry weight 4 wk after treatment.