Crosses between Culex pipiens form molestus and Cx. quinquefasciatus confirmed bidirectional incompatibility between them. In a genetic control operation the risks of release of fertile females could be avoided by irradiation, but complete sterilization of Cx. p. form molestus females required a higher dose (7 kR) than did Cx. quinquefasciatus females (6 kR). The unirradiated molestus males competed equally with unirradiated quinquefasciatus males, but the irradiated molestus males showed significantly reduced competitiveness.
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Arunachalam et al. (1985) studied this question.
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