Behavorial control of the pink bollworm, Pectinophora gossypiella (Saunders), through mating disruption with its sex pheromone (gossyplure) was first attempted by Shorey et al. (1976). The potential of pheromone systems for pink bollworm control was indicated when gossyplure was dispensed from nylon string wrapped aluminum foil evaporators placed in cotton fields. Subsequently, Gaston et al. (1977) dispensed gossyplure contained in thermoplastic fibers fashioned in 22 m diameter hoops which were placed by hand on cotton plants in the field. Pink bollworm (PBW) larval infestations in bolls were below economic levels and were similar in gossyplure-treated and insecticide treated fields from July through late August. A commercially developed hollow-fiber controlled-release system for gossyplure was registered for experimental use in 1976 (Brooks and Ketterman 1977) and granted full registration for use on cotton for pink bollworm control in 1978 (Brooks et al. 1979).