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Does natural larval parasitism of Lobesia botrana (Lepidoptera: Tortricidae) vary between years, generation, density of the host and vine cultivar?

Published online by Cambridge University Press:  09 March 2007

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

Abstract

pulations of European grapevine moth Lobesia botrana Franc, Sauvignon, Cabernet Sauvignon and Sémillon) using a natural L. botrana population during the first year, and a natural population supplemented with artificially inoculated individuals during the second year. Levels of natural populations of larval parasitoids were measured by their parasitism rate. The ichneumonid Campoplex capitator Aubert was the most common species collected from L. botrana larvae. Its incidence was higher during the spring compared to summer. The overall parasitism rate found on the experimental vineyard varied from 23% in 2000 to 53% in 2001, and was mainly due to C. capitator. Parasitism was not affected by the grape cultivar on which the host developed but was positively correlated with the host density, per bunch or per stock, suggesting that among the five grape cultivars tested, C. capitator females probably do not discriminate between hosts feeding on different grape cultivars, but rather the densities of L. botrana larvae.

Type
Review Article
Copyright
Copyright © Cambridge University Press 2006

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