Glyphosate-Resistant Waterhemp: Lessons Learned from the Devastation Resistant Palmer Amaranth has had on Southern Agriculture

Jason K. Norsworthy
2008 Proceedings of the Integrated Crop Management Conference   unpublished
Palmer amaranth has become increasingly prevalent in crop fields in the southern U.S. over the past 8 to 10 years . Glyphosate resistance in Palmer amaranth was first confirmed in Georgia in 2004 . Now, glyphosate-resistant Palmer amaranth is widespread in Georgia , Arkansas , Tennessee , North Carolina, South Carolina, Tennessee, and Mississippi. The resistant biotype is causing substantial yield loss, reduction in harvest efficiency, and complete abandonment of some fields. The focus of this
more » ... resentation will be on glyphosate-resistant Palmer amaranth, a close relative of waterhemp, including: its level of resistance, differences in resistant biotypes, extent of resistance, likely factors that have contributed to evolution of resistance, pollen and seed dispersal as a means for gene flow (resistance movement),
doi:10.31274/icm-180809-937 fatcat:tkrmcuugsbearg7w3hqqbcgmi4