Response of Cotton to Low Rates of Dicamba at Different Growth Stages

Susceptibility to glyphosate has decreased in various weed species. Recently, genetically modified (GM) row crops have been released to tolerate Engenia (dicamba) applications. Incorporating Engenia into a herbicide management program may help control 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 Engenia. Applications were made at three cotton growth stages, three- to four-leaf, at square, and at flowering. Engenia was applied at 1/16 X and 1/32 X rates of the labeled rate (1 X = 12.8 fl oz/A). A nontreated check was included.