EMERGENCE OF MALE-STERILE HELIOTHIS-VIRESCENS (LEPIDOPTERA, NOCTUIDAE) BACKCROSS MOTHS AT A CENTRAL RELEASE POINT AND THEIR RESULTING SPATIAL-DISTRIBUTION

Heliothis virescens backcross moths are most effectively released in w ide-area release programs from pupae placed in the field prior to moth emergence. A significantly greater moth emergence was obtained in the field from unharvested pupae in rearing trays than was obtained from harvested pupae. Mating, oviposition, and egg viability of emerged fem ale moths were not adversely affected by handling procedures. Moths re leased from emergence containers were recovered in the most distant tr ap, 5.5 km, from the release point. However, the greatest number of re leased moths was captured in pheromone traps within 1.7 km of the rele ase point.