Response of Cotton at Different Growth Stages to Low Rates of Enlist Duo

Glyphosate susceptibility in many weed species has decreased. In recent years, row crops with genetically modified (GM) tolerance to Enlist Duo (glyphosate + 2,4-D) is available to combat glyphosate-resistant weeds. A field study was conducted at the Delta Research and Extension Center, in Stoneville, Mississippi, in 2018 to evaluate cotton (Stoneville Bollgard II 4747GLB2) response at three growth stages to low rates of Enlist Duo. Applications were made at three cotton growth stages, three- to four-leaf, at square, and at flowering. Enlist Duo was applied at 1/16 X and 1/32 X rates of the labeled rate (1 X = 75 fl oz/A). A nontreated check was included.