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Diapause and its regulation in the whitefly Trialeurodes lauri

Published online by Cambridge University Press:  24 November 2010

D. Gerling ,
M. Guershon ,
E. Erel  and
M. Inbar
D. Gerling*
Affiliation:
Tel Aviv University, Department of Zoology, Israel
M. Guershon
Affiliation:
Tel Aviv University, Department of Zoology, Israel
E. Erel
Affiliation:
Tel Aviv University, Department of Zoology, Israel
M. Inbar
Affiliation:
University of Haifa, Department of Evolutionary and Environmental Biology, Israel
*
*Author for correspondence Fax: +036407830 E-mail: dange@tauex.tau.ac.il
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Abstract

This study focuses on the regulation of synchronization between the life cycle of the oligophagous whitefly, Trialeurodes lauri (Signoret), and its evergreen host tree Arbutus andrachne in Mediterranean chaparral. Whitefly infestations vary considerably among trees. The adults of the univoltine (one generation per year) whitefly emerge en masse during April and May and oviposit on the new spring foliage. Following approximately one month of development to the early fourth instar, the nymphs enter nine-month diapauses, terminating in February. This diapause is induced and maintained by the plant and can be experimentally avoided (in the case of developing young nymphs) or terminated (in the case of diapausing fourth instars), if whitefly-bearing branches are severed from the tree and placed in water under laboratory conditions. This study is the first report of a whitefly diapausing through both summer and winter seasons. The role of the host plant in the process is discussed.

Keywords

AleurodidaeMediterranean chaparraldiapausetree phenologyplant-insect interactionsynchronizationunivoltineArbutus
Type
Research Paper
Information
Bulletin of Entomological Research , Volume 101 , Issue 6 , December 2011 , pp. 741 - 747
Copyright
Copyright © Cambridge University Press 2010

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