In three seasons of replicated field trials, extended-release pheromone dispensers containing various combinations of Grandlure, eugenol, and DDVP (dichlorvos) were compared for efficacy to attract boll weevil (Anthonomus grandis Boh.) adults to the Plato Boll Weevil Trap„¥. Dispensers containing Grandlure and eugenol performed better in attracting boll weevils than Grandlure dispensers without eugenol. Dispensers combining Grandlure, eugenol and DDVP into a single dispenser demonstrated performance equivalent to separate Grandlure+eugenol and DDVP dispensers. Extended-release dispensers containing 25-mg of Grandlure captured similar numbers of weevils when changed at either 21-day or 28-day intervals; however, most boll weevil eradication programs will operate on a 21-day interval during post-eradication. Extended-release dispensers measuring 1" x 1" and 1" x 2" performed equally in a 2005 field trial. The use of dispensers combining Grandlure, eugenol, and DDVP are a viable approach to reducing costs associated with active or post-eradication boll weevil eradication programs.