All weevils that contacted un-aged double-coated BWACTs (0 weeks of age) and were collected died within 48 h. BWACTs aged 4 weeks killed 31% of the weevils in the spring upon contact and 75% and 78% of the weevils in the fall after 48 h. BWACTs aged 6 weeks killed 25% to 100% of the weevils in 48 h. Sixty milligrams of the pheromone grandlure were present in each BWACT and placebo. The range of times that weevils landed and contacted the BWACT formed a continuum and were extremely variable. In the spring, at both locations, range of times weevils collected from the placebo (the same formulation without malathion) was longer than the time determined on the BWACT. In the fall, times were variable at both locations. More boll weevils were found in buckets at the base of un-aged BWACTs than in buckets at the base of the 4 and 6 week BWACTs. More boll weevils were found in buckets at the base of the triple-coated aged BWACTs for the same times than at the base of the double-coated aged BWACTs. Number of weevils landing on BWACT were greater than number collected because some flew away before they were captured. Zero to 15 % of the total number of weevils observed approaching the BWACTs and placebos were fly-bys.