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The bionomics of Listronotus bonariensis (Coleoptera: Curculionidae) in Canterbury, New Zealand

Published online by Cambridge University Press:  10 July 2009

S.L. Goidson*
Affiliation:
AgResearch, PO Box 60, Lincoln, New Zealand
J.R. Proffitt
Affiliation:
AgResearch, PO Box 60, Lincoln, New Zealand
D.B. Baird
Affiliation:
AgResearch, PO Box 60, Lincoln, New Zealand
*
* Fax: +64 3 325 6904 E-mail: goldsons@agresearch.cri.nz

Abstract

A study was conducted in 1990–1995 in Canterbury, New Zealand to describe the phenology and seasonal abundance of all stages of the Argentine stem weevil Listronotus bonariensis (Kuschel), a New Zealand pest of Gramineae. Of note were major fluctuations in the densities of all stages from one season to the next which were not explained directly in terms of the availability of Neotyphodium lolii-free ryegrass tillers. The overwintering mortality rates of L. bonariensis were found to be linear and remarkably similar between seasons and locations in the absence of pathogens. This study also showed that care must be taken in the use of existing data to analyse the impact of the recently introduced South American parasitoid wasp Microctonus hyperodae Loan as a biological control agent of L. bonariensis; errors may exist because of earlier sampling biases. In spite of the confounding effects of seasonal variation in the L. bonariensis population, reduction in the size of the L. bonariensis first summer generation egg and larval peaks coincided with a build up of M. hyperodae.

Type
Research Article
Copyright
Copyright © Cambridge University Press 1998

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