In 1998, IRAC-US sponsored a bollworm monitoring program to determine if a widespread change in the susceptibility of the bollworm to the pyrethroid insecticides is occurring. Bollworm moths were collected and tested in Alabama, Arkansas, Georgia, Louisiana, Mississippi, Missouri, North Carolina, South Carolina and Texas. Over 10,200 moths were bioassayed from June through October 1998. Survival at the 5 mg/vial dose of cypermethrin ranged from a low of 0% to a high of 21.2% in Louisiana during June. Louisiana (June and July), Alabama (July) and North Carolina (September) were the only collection locations to exceed 10% survival at the 5 mg/vial dose. Survival at the 10 mg/vial dose of cypermethrin ranged from 0% to a high of 4.9% in Alabama during July. Alabama (July), Louisiana (July) and North Carolina (September) were the only three collections to exceed 2% survival at the 10 mg/vial dose. The increasing tolerance of the bollworm to the pyrethroids demonstrated in this study, suggest that maintaining the effectiveness of the pyrethroids against the bollworm should become a higher priority in future resistance management plans.