Weeds Resistant

Mississippi State University reports that five common ?EUR??,,????'?????<

Tom Eubank, a Mississippi Agricultural and Forestry Experiment Station scientist, said that before Roundup Ready crops were developed, weed control was accomplished primarily with residual herbicides and tillage. A few post-emergence herbicides were also available to control weeds that emerged during the growing season.

Glyphosate resistance was documented in horseweed in 2000 in Delaware and in Mississippi in 2003. In 2005, glyphosate resistance was documented in Palmer amaranth in Georgia, and in Mississippi in 2008. By 2005, Mississippi had glyphosate-resistant horseweed and Italian ryegrass, and resistant water-hemp in 2010.