- Author: Lynn M. Sosnoskie
- Author: Ted Webster
- Author: Stanley Culpepper
Since it was first identified in 2004, glyphosate-resistant Palmer amaranth has become the most significant weedy pest of cotton in the Southeastern United States. When acceptable control is not realized, and Palmer amaranth is allowed to set seed, population densities can become quite high in infested fields. For example, research conducted by the University of Georgia indicated that Palmer amaranth seed densities exceeded 35,000 seeds per m2 in a cotton field where the glyphosate-resistant biotype had been ineffectively managed.
To combat Palmer amaranth, some cotton growers in Georgia have resumed using pre-plant deep-tillage and in-crop cultivation in fields with high weed population densities....