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A bioassay to evaluate the activity of chemical stimuli from grape berries on the oviposition of Lobesia botrana (Lepidoptera: Tortricidae)

Published online by Cambridge University Press:  09 March 2007

N. Maher
Affiliation:
UMR 1065 Santé végétale, INRA, BP 81, 33883 Villenave-d'Ornon Cedex, France
D. Thiéry*
Affiliation:
UMR 1065 Santé végétale, INRA, BP 81, 33883 Villenave-d'Ornon Cedex, France
*
*Fax: +33 5 57 12 26 32 E-mail: [email protected]

Abstract

A two-choice bioassay was developed to evaluate the role of host-plant berry compounds on the oviposition site acceptance of the generalist moth Lobesia botrana (Denis & Shiffermüller). A key feature was the lining of the bioassay arena with felt which focused oviposition on the test substrates. Initial experiments comparing substrates with different physical features indicated that smooth textures and spherical shapes with interstices favour oviposition. Artificial oviposition substrates were thus constructed with glass spheres in order to test the behavioural activity of grapevine berry extracts. Only polar extracts obtained by soaking berries in methanol or water stimulated oviposition (more eggs were laid on the extract-treated substrate than on the control substrate), whereas more apolar ones obtained with chloroform or hexane had no significant effect. The prior removal of epicuticular waxes from grape berries before extraction did not enhance the stimulatory activity of the methanol extract. The oviposition response to this extract was dose-dependent. It is concluded that polar compounds present on grape berries act as oviposition stimulants for L. botrana.

Type
Research Article
Copyright
Copyright © Cambridge University Press 2004

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