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Advantageous attributes of larval whitefringed weevil, Naupactus leucoloma (Coleoptera: Curculionidae) for bioassaying soil fumigants, and responses to pure and plant-derived isothiocyanates

Published online by Cambridge University Press:  09 March 2007

J.N. Matthiessen  and
M.A. Shackleton
J.N. Matthiessen*
Affiliation:
CSIRO Entomology, Private Bag 5, Wembley, WA 6913, Australia
M.A. Shackleton
Affiliation:
CSIRO Entomology, Private Bag 5, Wembley, WA 6913, Australia
*
*Fax: +61 8 9333 6646 E-mail: johnm@ccmar.csiro.au
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Abstract

First instars of the soil-inhabiting whitefringed weevil, Naupactus leucoloma(Boheman), are a particularly good bioassay model for assessing volatile soil fumigants and biofumigants. Eggs are readily obtained and can be stored for long periods with larvae hatched on demand and the first instar is non-feeding, surviving without food or shelter. Longevity varies with temperature, but readily accommodates the period required to conduct bioassays without appreciable mortality of untreated controls. In vitro bioassays of pure methyl isothiocyanate, the active ingredient from metham sodium soil fumigant, and the less volatile 2-phenylethyl isothiocyanate, sensitively detected differences in toxicity and effects of temperature. Bioassay of volatiles emitted from hydrolysed tissue of various isothiocyanate-producing Brassicaplants revealed widely varying toxicity effects, indicating that bioassays with N. leucoloma are a sensitive and relevant indicator of the potential of different plants for biofumigation of soil-borne pest organisms.

Type
Research Article
Information
Bulletin of Entomological Research , Volume 90 , Issue 4 , August 2000 , pp. 349 - 355
Copyright
Copyright © Cambridge University Press 2000

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