Yelllow nustedge control systems were evaluated for three years to determine the effect of preemergence and postemergence cotton herbicides with yellow nutsedge activity on yellow nutsedge control, populations, and cotton yield. In all systems examined, yellow nutsedge populations were reduced with three annual applications of the same herbicide program when compared to a control without yellow nutsedge control present. In general, systems that included preemergence and postemergence control of yellow nutsedge provided better yellow nutsedge control than preemergence or postemergence only systems. Staple provided approximately 85% control of yellow nutsedge when applied preemergence. Reflex provided excellent (>95%) yellow nutsedge control for the entire study period. Command did not provide adequate control of yellow nutsedge. Zorial applied as a split application of 0.8 lb/A applied preplant incorporated and 0.8 lb/A applied preemergence provided better overall yellow nutsedge control than Zorial applied preemergence at 1.5 lb/A. The addition of Staple to MSMA significantly improved yellow nutsedge control as compared to MSMA applied alone. Roundup with and without cultivation provided approximately 95% yellow nutsedge control in 1997 under optimal conditions for activity. However, in 1998, when poor conditions for Roundup activity were present, Roundup without cultivation control was 75-80% depending upon rate applied.