Inbred crosses through three generations and reciprocal backcrosses through five generations using Helicoverpa zea (Boddie) from Stoneville, MS, and H. armigera (Boddie) from Tashkent, Russia, were studied for backcross sterility. A high percentage of mated females reproducing indicated a high degree of genetic compatibility between the two species. No indication of backcross sterility was detected in these studies.
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Laster et al. (1995) studied this question.