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SEX PHEROMONE COMPONENTS OF ENARMONIA FORMOSANA (LEPIDOPTERA: TORTRICIDAE)

Published online by Cambridge University Press:  31 May 2012

Crawford McNair ,
Gerhard Gries  and
Regine Gries
Crawford McNair
Affiliation:
Centre for Pest Management, Department of Biological Sciences, Simon Fraser University, Burnaby, British Columbia, Canada V5A IS6
Gerhard Gries*
Affiliation:
Centre for Pest Management, Department of Biological Sciences, Simon Fraser University, Burnaby, British Columbia, Canada V5A IS6
Regine Gries
Affiliation:
Centre for Pest Management, Department of Biological Sciences, Simon Fraser University, Burnaby, British Columbia, Canada V5A IS6
*
1Author to whom all correspondence should be addressed.
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Abstract

(E)-9-Dodecenyl acetate (E9-12:OAc) and (Z)-9-dodecenyl acetate (Z9-12:OAc) are major components of the sex pheromone of the cherry bark tortrix (CBT), Enarmonia formosana (Scopoli), in British Columbia. The compounds were identified in extracts of female pheromone glands by coupled gas chromatographic – electroantennographic detection (GC–EAD) and coupled GC – mass spectrometry. In field experiments, traps baited with E9-12:OAc or Z9-12:OAc singly were unattractive to male CBT, but in combination at ratios of 50:50 or 40:60 captured numerous males. Increasing quantities of this two-component pheromone blend resulted in increasing captures of male CBT. This binary blend at a 10-mg dose caught more CBT males that did caged virgin CBT females. Eight other EAD-active acetates identified in extracts of pheromone glands failed to enhance attractiveness of the pheromone blend. These compounds may serve to reduce cross-attraction of heterospecific male moths or may play a role in courtship behaviour. Formulations of synthetic pheromone are being evaluated for management of the CBT using mass trapping or disorientation of male CBT moths.

Résumé

L’acétate de (E)-9-dodécényl (E9-12 : OAc) et l’acétate de (Z)-9-dodécényl (Z9-12 : OAc) sont les principales composantes de la phéromone sexuelle chez la tordeuse Enarmonia formosana (Scopoli) en Colombie-Britannique. Ces substances ont été identifiées dans des extraits de glandes à phéromone de femelles par une technique combinant chromatographic en phase gaseuse et détection par électroantennographie (GC-EAD) et par combinaison chromatographie en phase gaseuse – spectrométrie de masse. Dans des expériences sur le terrain, des pièges garnis de E9-12 : OAC seul ou de Z9-12 : OAC seul n’ont pas attiré de mâles de la tordeuse, mais les deux substances combinées dans des proportions de 50 : 50 ou 40 : 60 ont attiré de nombreux mâles. Une augmentation des quantités de ce mélange a donné lieu à des captures encore plus nombreuses de mâles de la tordeuse. Une dose de 10-mg de ce mélange à deux composantes a attiré plus de mâles que la présence de femelles vierges en cage. L’addition de l’un ou l’autre des huit acétates identifiés par GC-EAD dans les extraits de glandes à phéromone n’a pas augmenté le pouvoir d’attraction du mélange. Ces substances servent peut-être à réduire l’attraction d’autres mâles hétérospécifiques ou ont peut-être un rôle à jouer dans le comportement de cour. L’efficacité de diverses phéromones synthétiques dans la lutte contre cette tordeuse par piégeage en masses ou comme agents de désorientation des mâles est actuellement à l’étude.

[Traduit par la Rédaction]

Type
Articles
Information
The Canadian Entomologist , Volume 131 , Issue 1 , February 1999 , pp. 85 - 92
Copyright
Copyright © Entomological Society of Canada 1999

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