Termination of reproductive diapause in the rice water weevil with particular reference to the effects of temperature

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The period of diapause termination in adults (collected in Yueqing 120.94°E, 28.14°N, Zhejiang) of the rice water weevil, Lissorhoptrus oryzophilus Kuschel (Coleoptera : Curculionidae), were determined by initially exposing diapausing adults to various constant temperatures (25-5℃) as well as to room temperatures (33--1℃), and then transferring them at intervals to a climatically controlled chamber (26 ± 1℃, using rice seedlings as adult hosts) where the dynamics of oviposition onset and the numbers of eggs deposited were observed. Under room temperature, the diapause in 1st- and 2nd-generation adults terminated around late September and early December, respectively, i. e. at ca. 2.5 and 2.0 months after collection. Diapause in both 1st- and 2nd-generation adults was significantly affected by temperature. When exposed to 10, 15 and 20℃, the diapause in most 1st-generation adults terminated after 75, 25 and 50 days, respectively, while in 2nd-generation adults it terminated after 50 days at each of these temperatures. The associated adaptive significance and geographical variation of diapause termination in this insect are discussed.
日本応用動物昆虫学会の論文
2004-11-25