On elytral color dimorphism of sweet potato [Ipomoea batatas] weevil, Cylas formicarius (Fabricius), in the Southwest islands, Japan
2005
Kawamura, K. (Kinki Univ., Higashiosaka, Osaka (Japan). Faculty of Agriculture) | Kandori, I. | Sakuratani, Y. | Sugimoto, T.
Sweet potato weevil, Cylas formicarius, is a serious pest of sweet potato, distributed widely in the tropic and subtrophic areas of the world, containing Southwest islands in Japan. We recognized a dimorphism of elytral color, bluish and greenish elytra (BE and GE), in weevils collected in Southwest islands of Japan, This study examined the geographic distribution in Southwest islands of Japan, an inheritance and a cold tolerance of these forms of C. formicarius and obtained following results. 1) GE occupied more than 96% of wild male weevils collected in Miyakojima and Ishigakijima, while it was inversely minor in Amami-Ohshima and OkinawaHontou. 2) The color forms of C. formicarius would be genetically determined and GE would be a genetically dominant to BE. 3) BE would be more suitable to acquire a tolerance to a lower temperature. This property corresponds well with a remarkably high frequency of BE of wild weevils found in Amami-Ohshima and Okinawa-Hontou.
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