Determining the Fitness Components of (Sitophilus oryzae L.) on Imported Wheat in Egypt

Document Type : Original Article

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Department of Stored product pests, Plant protection Research Institute, Agriculture research center, Alexandria, Egypt

Abstract

The rice weevil, Sitophilus oryzae (L.) is an extremely destructive beetle species that attacks different types of stored products worldwide. Four imported wheat from Russia, Ukraine, Australia, Poland and one from Egypt were collected and surveyed for the different insect types "feral weevils" in all samples during the first two months by one time/week. Sitophilus oryzae, as it was found from the survey data to be the only dominant species. Natural mixing for the different wheat populations with the Egyptian wheat were done. Different fitness component such as adult’s longevity (day), life cycle (day), number of resulting weevils, adult’s length (mm) and weight of adults (mg) were calculated for parents and their hybrids. Losses percentage also was detected. The results indicated that all the wheat samples were infected by rice weevils except the Australia wheat. Natural mixing with the Egyptian wheat caused an increase in all biological parameters and heterosis in the next generation.

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