These will often require a tank-mix, or alternative treatment to control. Also he says under the Roundup Ready cotton system growers may see increases in spurges, prickly sida, hemp sesbania, Florida pusley, pitted morningglory, barnyard grass, maypop passionflower and bermudagrass. The reason for increases in these weeds is due to the fact that common use rates of Roundup will often not provide adequate control. There is an additional challenge for growers who rotate Roundup Ready cotton and Roundup Ready soybeans. Hayes says keeping out volunteer soybeans can be quite a challenge during cotton season.
Soybeans once established have tolerance to many residual cotton herbicides.
Hayes offers a conditional yes. He says that the simple answer is to avoid doing the same thing year after year, both in terms of crop rotations and herbicide choice. In accordance with Title 17 U.S.C. Section 107, this material is distributed for research and educational purposes only.