Diapause development in the chestnut weevilCurculio elephas |
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Authors: | F Menu |
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Institution: | (1) Laboratoire de Biométrie, Génétique et Biologie des Populations (URA CNRS 243) Université Claude Bernard. 43, bd du 11 novembre 1918, 69622 Villeurbanne Cedex, France |
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Abstract: | Larval diapause development in the chestnut weevilCurculio elephas (Coleoptera, Curculionidae) was studied in the laboratory at different temperatures. The results proved that exposure to
low temperatures (3–6°C) in the period December–February is not required to complete diapause. The diapause is terminated
in December and from January on, the larvae can initiate post-diapause morphogenesis in the laboratory, if temperatures allow
it. In the field developmental rates are negligible during winter cold (4–6°C) and only after March morphogenesis can proceed
with no interruption until adult emergence. Diapause and post-diapause quiescence contribute to individual synchronization
for initiation of development. The observed spread of adult emergence was 30 days in the laboratory. This variability produced
during post-diapause development may be a response to annual variation in the phenology of the chestnuts. |
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Keywords: | diapause development chilling post-diapause morphogenesis prolonged diapause weevil |
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