Cissampelos glaberrima and Blainvillea romboidea are aggressive species and difficult to be controlled in the beginning of their dispersal in sugarcane crops in the state of Sao Paulo. The objective of this experiment was to study the efficacy of trifloxysulfuron-sodium + ametryne, picloram + 2,4-D, 2,4-D and fluroxypyr, applied in post emergence, in controlling these weed species in sugarcane crops. The experiment was arranged in a randomized block design with six treatments and four replications. Visual evaluations of the treatments were performed at 7, 14, 21, 29, 36, 42, 56, and 90 days after application (DAA) . Sugarcane plant height was measured at 29 and 56 DAA and the number of shoots counted at 33 DAA. At harvest, the number and weight of shoots were also evaluated. Although trifloxysulfuron-sodium + ametryne had a quick effect on shoots of C. glaberrima adult plants, it did not prevent their re-growth at 42 days after its application .However, picloram + 2,4-D (2,040 g ha-1) and fluroxypyr (345 g ha¹) maintained control levels of C. glaberrima above 90%, up to 90 DAA. B. romboidea control was not satisfactory with trifloxysulfuron-sodium + ametryne application, but rather effective (100%) with the other chemical treatments.
herbicides; weeds; hormonal; trifloxysulfuron-sodium
