Zidua or pyroxasulfone is a member of a new class of chemistry that is now labeled in corn and soybeans for the control of grasses and small-seeded weeds. It is not registered in cotton at this time, but cotton researchers are looking at ways to use the herbicide to control Palmer amaranth and other problem weeds. Graduate student Whitney Crow talked about the research during the recent UT Cotton Tour in Jackson, Tenn.
Researchers are comparing Zidua with older chemistries and in tank mixes with Roundup PowerMax and Liberty. The older compounds include pre-emergence herbicides such as Warrant and Dual Magnum. Label rates of each herbicides were applied in cotton that was planted April 26 in plots at the Jackson facility.
Crow said a tank mix of Zidua and Liberty provided 95 percent control of Palmer amaranth. Researchers noted a higher level of injury with the Zidua-Liberty tank mix than with Warrant and Dual Magnum. Researchers will be addressing that issue in future studies.