Abstract: Background: Efficient management of S. americanum (Black nightshade) requires understanding its competitive behavior with soybean and the species’ sensitivity to herbicides. Objective: To evaluate the competitive ability of S. americanum infesting soybean and to assess potential herbicides for post-emergence control of the weed. Methods: Two greenhouse experiments were conducted using a completely randomized design with four replications. In the first experiment, the competitive ability of soybean was tested in the presence of different densities of S. americanum. In the […]