Results of a study in1996 that compared the effects of various early-season treatments on insect populations and yieldshow that during a low insect year, yield responses to seed treatments (imidacloprid, acephate), in-furrow treatments (imidacloprid, aldicarb), and in-furrow plus sidedress treatments (aldicarb) in both Bollgard (NuCotn-33B) and Sure Grow 501 were similar. The highest yield in both cotton varieties were in treatments with the high rate of imidacloprid and the aldicarb in-furrow plus sidedress treatments. The total insect control cost for Bollgard cotton was $66.20 per acre per acre of which $32.00 was technology charge, and $64.34 per acre in the Sure Grow 501.