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Reproductive diapause in the Argentine stem weevil, Listronotus bonariensis, (Kuschel) (Coleoptera: Curculionidae), in New Zealand

Published online by Cambridge University Press:  10 July 2009

S. L. Goldson
S. L. Goldson
Affiliation:
Department of Entomology, Lincoln College, Canterbury, New Zealand
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Abstract

To improve the precision of understanding of the phenology of Listronotus bonariensis (Kuschel), samples were collected at regular intervals near Canterbury, New Zealand, and the seasonal changes in their reproductive morphology monitored by regular dissection. It was demonstrated that the adult weevils enter hibernatory reproductive diapause in early March and remain in this state until late July when reproductive activity resumes. Adults emerging in February may enter diapause immediately. The existence of diapause was further supported by its associated cessation of mating, increase in body fat and apparent drop in the haemolymph titre of juvenile hormone. Laboratory experiments indicated that a critical photoperiod induces diapause and an eventual reduction in sensitivity to photoperiod allows reproductive activity to resume.

Type
Original Articles
Information
Bulletin of Entomological Research , Volume 71 , Issue 2 , June 1981 , pp. 275 - 287
Copyright
Copyright © Cambridge University Press 1981

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