End-of-season insect control termination rules for tarnished plant bug (Lygus lineolaris (Palisot de Beauvois)) were evaluated in a field trial in Northeastern Arkansas in fall 2001. Natural infestations were augmented with release of 3 to 5 nymphs (3rd instar) per plant starting at about 1 week after physiological cutout (NAWF=5) and at the time of the latest possible cutout date for the area, 9 Aug. Additional releases were made over the next 3 weeks. TPB infestations were initiated at 150, 296 or 375 DD60s after physiological cutout. Crop injury observations made in late August indicated significant TPB feeding injury to upper canopy bolls. Yield data indicated no yield penalty from late season infestations compared to untreated plots or to protected cotton that had received 4 applications of Centric 40 WG (thiamethoxam) (3 oz/ac); the last application occurred at 488 DD60s past physiological cutout. Lint yields ranged from 1186 to 1253 lb/ac. Results from this one season of research indicate that insect control termination rules that have been in use for heliothine caterpillars and boll weevils (cutout +350 DD60s) are more than sufficient for late season plant bug management.