A release of sterile backcross insects was conducted in a 12.8 x 12.8 km (8 x 8 mile) area in the vicinity of Friars Point, Mississippi during 1991. Moth captures in pheromone traps indicated that released moths were distributed over the entire trapped area. Moth emergence was low during the release period when minimum temperatures were below 60 F. Some emergence containers collapsed during rainy periods and moth-escape openings expanded in some of the containers allowing the entrance of birds. More information on sterile: fertile moth ratios in the field was obtained from mating trapped males with virgin females than was obtained from mating males from field collections of eggs and larvae.