Abstract Background Weed interference in crops causesproblems that reflect in several losses. Several control methods are available, among them, chemicals are commonly used. Objective Our objective was to evaluate the effectiveness of different herbicides used alone and in combinations in the control of horsetail grass ( Andropogon bicornis ) at different phenological stages. Methods The experiment was carried out in an area with natural infestation of A. bicornis in the municipality of São Miguel das Missões, in Rio Grande do […]