In 1987, the MOTHZV dynamic Heliothis model was used as a decision aid to help schedule applications of bifenthrin and chlordimeform in cotton at Halfway, TX. Pheromone trap catch was used to initiate the model in cotton, and predictions of adults migrating from corn to cotton were used to generate bollworm populations in cotton. Model prediction and field counts of eggs agreed, but larval population and boll damage estimates showed that some adjustments to model predictions are needed. Yields with bifenthrin were significantly higher, but with only chlordimeform, yields were not significantly different than with the untreated check.