This research aimed to evaluate selectivity of azafenidin+hexazinone, diuron+hexazinone, metribuzin and isoxaflutole on sugarcane, applied early and during late postemergence in dry season. The study was conducted over 4-yr sugarcane ratoons (cv. RB 835089), in Araras, SP. The experimental design was a randomized block (four replications) with five treatments, plus one weed control to each chemical treatment. The treatments were: diuron+hexazinone (1,170+330 g ha-1), azafenidin+hexazinone (192,5+247,5 g ha-1), metribuzin (1,92 L ha-1 ) and isoxaflutole (127,5 g ha-1 ) and weed control. Height, stand, chlorophyll, fluorescence index, production and technological characteristics were analyzed by the F test and the "t" test, for average comparison. The herbicides caused more damage to the sugarcane in later postemergence. At initial postemergence, the herbicides did not cause any damage to the sugarcane. At later postemergence, azafenidin+hexazinone, isoxaflutole and diuron+hexazinone damaged fluorescence index and sugarcane production.
phytointoxication; Saccharum spp.
