Fields test during 1998 and 1999 were conducted to study the interaction of nitrogen fertilization and insect control decisions. Insect data and plant data were collected from replicated plots treated with 90, 120, 150, 180, and 210 lbs. of nitrogen per acre. No results clearly indicate that increasing nitrogen fertilization increases numbers of insects. Four of the plots exceeded heliothine treatment thresholds only one time in the 2 years. The only treatment, which did not exceed treatment thresholds, was the plots fertilized with 150 lbs. per acre nitrogen. Statistically there were no differences in the heliothine larval data. Delay caused by nitrogen fertilization caused one extra boll weevil insecticide to be applied in 1998 to plots fertilized with 150 lbs. of nitrogen per acre or higher. Dollars returned above specified costs were not different in any treatment fertilized at or above 120-lb. nitrogen per acre.