The use of glyphosate as a rope-wick, spot-spray, preplant, or postemergence-directed (PD) treatment has occurred in cotton since its introduction in the 1970's. The development of glyphosate resistant cotton varieties has provided new opportunities for postemergence-topical (PT) control of many troublesome weeds in-season. In weed control studies conducted from 1996 to 1999 at several locations across the Texas Southern High Plains, glyphosate was evaluated alone or as part of a wed control program that included residual herbicides. In a 1998 field experiment, pendimethalin at 1.12 kg/ha applied preplant incorporated followed by (fb) prometryn at 1.3 kg/ha applied preemergence did not control silverleaf nightshade. Pendimethalin fb prometryn fb glyphosate PT at 0.84 kg/ha controlled silverleaf nightshade at least 50%.
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