Revista Brasileira De Herbicidas 2017; 16(3): 206-215
Chemical control alternatives for glyphosate-resistant sourgrass using hebicides indicated for corn and cotton crop
In Brazil cropping systems is common a rotation between soybean, corn and / or cotton, all resistant to glyphosate, which favor the selection of glyphosate resistant sourgrass populations (Digitaria insularis). Little is known about alternative chemical control of D. insularis registered for the corn and cotton crops. Thus, it is relevant to investigate herbicides with alternative mode of action, applied in pre and post-emergence conditions, to be used for efficient control of the glyphosate resistant sourgrass biotype (D. insularis). The experiment was conducted in greenhouse, from September to December of 2014, using a glyphosate resistant D. Insularis biotype. The statistical design was randomized blocks with four replications. The application occurred when sourgrass plants were at the 1 to 2 tillers stage for post-emergent and at pre-emergence for the pre-emergent herbicides. The treatments which showed the best results in post-emergence conditions were the nicosulfuron, imazapic + imazapyr, atrazine, haloxyfop-methyl and tepraloxydim herbicides. Atrazine, isoxaflutole, S-metolachlor, clomazone, diuron and flumioxazin presented themselves as effective pre-emergents for controlling this species.
472