Helicoverpa armigera larvae imported from Australia were brought to the USDA Stoneville Research Quarantine Facility (SRQF), at Stoneville, Mississippi. Female moths that developed from these larvae were mated with laboratory reared H. zea males in an attempt to obtain hybrid male sterility. Progeny from these matings through the F(5) and fourth backcross generations were monitored for male sterility. Mating incidence in the parental cross was extremely low but progeny were obtained from all complete matings. The mating incidence improved considerably in successive backcross generations with no significant male sterility. However, the mating incidence remained low in successive filial generations with some evidence of sterility. Therefore, further investigation is needed before the possibility of hybrid male sterility from H. armigera x H. zea can be ruled out.