Insecticide termination rules for Southeast Arkansas were validated during the 2000 growing season on a producer’s cotton field in Desha County, AR. Two insecticide termination systems were compared: NAWF = 5 + 350 heat units (early system advocated by COTMAN), and NAWF = 5 + 598 heat units (standard system recommended by consultants). In comparing the two systems, we looked at such variables as boll count and retention rate, lint per boll, lint yield, and net return. No statistical differences were found for any of the aforementioned variables between the two insecticide termination systems. Plots in the standard termination system yielded numerically about 63.6 lb/acre more lint than those in the early (COTMAN) termination system. Net return was also statistically similar between the two insecticide termination systems. A numerical difference of about $13.13 in net return was in favor of the standard termination system. No economic benefits were gained by making two extra insecticide applications in excess of the crop protection regime recommended by COTMAN.