Cytoplasmic Incompatibility: Occurrence in a Stored-product Pest Ephestia cautella11

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Abstract
Cytoplasmic incompatibility between allopatric strains of Ephestia cautella (Walker) from Iran and the U.S. was found. The incompatibility was unidirectional: Iranian females were incompatible with males from both laboratory and field strains from the U.S. As a result, mating was normal, sperm was transferred, and oviposition was normal, but the eggs were almost completely infertile. Reciprocal crosses were normal in egg fertility. The inheritance of the incompatibility factor was studied through 2 filial generations. Transmission of incompatibility was through the cytoplasm of the egg. Thus male progeny of an incompatible female carry the factor, but they cannot transmit it. Female progeny of an incompatible female carry the factor and also transmit it to all their offspring. This incompatibility might be used for the control of some field populations of E. cautella.

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