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Inter specific crosses between Helicoverpa annigera (Hübner) from China and H. zea (Boddie) were evaluated for sterility. Reciprocal crosses through 2 inbred generations and Back crosses through 4 generations were evaluated. Although few matings were obtained for some crosses, all crosses mated and produced offspring. Sterility was not detected in any cross.
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Laster et al. (1995) studied this question.
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