Research to establish and validate end-of-season crop management guides for timing final furrow irrigation and for terminating insecticide applications for tarnished plant bug (Lygus lineolaris (Palisot de Beauvois)) is underway in Arkansas. In the 2nd year of a planned 3-year study, we have examined interactions of late season irrigation and insect control in a field trial on the University of Arkansas Cotton Branch Experiment Station in Marianna. In 2004, the termination of insecticide and irrigation prior to physiological cutout (mean NAWF =5 (nodes above white flower))resulted in significant yield penalties compared to later termination dates. Extending insecticide sprays past 240 DD60 after physiological cutout (NAWF=5) or irrigation beyond 350 DD60s after NAWF=5 did not significantly improve yields. Late irrigations delayed boll opening. The 2004 season was characterized by high population densities of plant bugs and dry conditions in late season. Results from the 2004 research in the Central Eastern Arkansas indicate that the insect control termination guide in COTMAN that has been in use for heliothine caterpillars and boll weevils (NAWF=5 +350 DD60s) is more than sufficient for late season plant bug management, and timing of final furrow irrigation also may be appropriate at this same crop stage. These results will be updated with results from the 2005 study.