Injury potential of herbicide combinations on XtendFlex® cotton

Abstract XtendFlex® technology from Bayer allows growers to apply glyphosate, glufosinate, and dicamba POST cotton. Since the evolution spread of glyphosate-resistant weed species, early applications with several modes action have become common. However, crop injury potential these warrants further examination. Field studies were conducted 2015 2017 at two locations in Mississippi evaluate cotton herbicide application. Herbicide made three- six-leaf stage combinations composed two-, three-, four-way S -metolachlor, three formulations dicamba. Data collection included visual estimations injury, stand counts, height, total mainstem nodes, nodes above whiteflower first bloom. end season cracked boll. Visual highest 3 d following containing glufosinate + -metolachlor (36% 41% injury) combination glyphosate (39% injury), regardless formulation. Crop decreased each rating interval dissipated by 28 (P = 0.3748). Height reductions present bloom < 0.0001), although yield was unaffected 0.2089), even when after application greater than 30%. Results indicate that may a variety tank mixtures expect no penalty. Furthermore, if are concerned applications, use should be approached caution