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Olfactory activity of ethyl (E,Z)-2,4-decadienoate on adult oriental fruit moths

Published online by Cambridge University Press:  02 April 2012

Fabio Molinari ,
Gianfranco Anfora ,
Silvia Schmidt ,
Michela Villa ,
Claudio Ioriatti ,
Edison Pasqualini  and
Antonio De Cristofaro
Fabio Molinari*
Affiliation:
Istituto di Entomologia e Patologia vegetale, Università Cattolica del Sacro Cuore, via Emilia Parmense 84, I-29122 Piacenza, Italy
Gianfranco Anfora
Affiliation:
Research and Innovation Centre, Istituto Agrario di San Michele all'Adige, Fondazione Edmund Mach, Via Edmund Mach 1, I-38010, San Michele all'Adige, Trento, Italy
Silvia Schmidt
Affiliation:
Research and Innovation Centre, Istituto Agrario di San Michele all'Adige, Fondazione Edmund Mach, Via Edmund Mach 1, I-38010, San Michele all'Adige, Trento, Italy
Michela Villa
Affiliation:
Istituto di Entomologia e Patologia vegetale, Università Cattolica del Sacro Cuore, via Emilia Parmense 84, I-29122 Piacenza, Italy, and Research and Innovation Centre, Istituto Agrario di San Michele all'Adige, Fondazione Edmund Mach, Via Edmund Mach 1, I-38010, San Michele all'Adige, Trento, Italy
Claudio Ioriatti
Affiliation:
Research and Innovation Centre, Istituto Agrario di San Michele all'Adige, Fondazione Edmund Mach, Via Edmund Mach 1, I-38010, San Michele all'Adige, Trento, Italy
Edison Pasqualini
Affiliation:
Dipartimento di Scienze e Tecnologie Agroambientali, Università di Bologna, Viale Giuseppe Fanin 42, I-40137 Bologna, Italy
Antonio De Cristofaro
Affiliation:
Department of Animal, Plant and Environmental Sciences, University of Molise, Via De Sanctis, I-86100, Campobasso, Italy
*
1 Corresponding author (e-mail: fabio.molinari@unicatt.it).
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Abstract

We investigated whether or not pear ester (ethyl (E,Z)-2,4-decadienoate) attracted adult oriental fruit moths, Cydia molesta (Busck) (Lepidoptera: Tortricidae). The electroantennographic responses of C. molesta to pear ester were recorded and dose–response curves calculated. In laboratory bioassays, the attractiveness of different dosages was assessed in a dual-choice olfactometric arena. The responses of virgin males and females to pear ester in the presence and absence of pear (Pyrus communis L.), peach (Prunus persica (L.) Batsch.), and apple (Malus ×domestica Borkh.) (Rosaceae) shoots were evaluated. Electroantennographic recordings demonstrated that both male and female C. molesta were able to detect the pear ester. In our bioassay, however, pear ester readily attracted males but attracted very few females. The response of males was dose-dependent and they preferred pear ester over apple- and pear-shoot volatiles, whereas no apparent preference between pear ester and peach-shoot volatiles was observed. Therefore, this kairomonal compound could be more effective in attracting C. molesta when applied in orchards of secondary host plants, like apple or pear, than in peach orchards.

Résumé

Des essais ont été effectués pour étudier l'effet attractif de l'ester de poire, éthyle (E,Z)-2,4-decadienoate, sur les adultes de Cydia molesta (Busck) (Lepidoptera: Tortricidae). Les réponses électroantennographiques de C. molesta à l'ester de poire ont été enregistrées et les courbes de dose–réponse ont été calculés. L'attraction aux différentes doses a été évaluée grâce à des essais au laboratoire sous forme de tests de choix dans un olfactomètre à deux choix. La réponse des mâles et des femelles vierges à l'ester de poire a été évaluée en présence et en absence des rameaux de poire (Pyrus communis L.), pêche (Prunus persica (L.) Batsch.) et pomme (Malus ×domestica Borkh.) (Rosaceae). Les enregistrements électroantennographiques ont démontré que les mâles et les femelles de C. molesta sont capables de détecter l'ester de poire. Dans notre test de choix l'ester de poire a attiré les mâles alors que les femelles étaient moins sensibles. La réponse des mâles est dépendante de la dose. Les mâles ont montré une préférence pour l'ester de poire, comparativement à la pomme et aux volatiles des rameaux de poire, alors qu'aucune préférence n'a été observée lorsque l'ester de poire était en concurrence avec les volatiles des rameaux de pêche. Par conséquent, ce composé kairomonal pourrait être plus efficace pour attirer la tordeuse orientale lorsqu'il est appliqué dans les vergers de plantes-hôtes secondaires, comme la pomme et la poire, plutôt que dans le verger de pêches.

Type
Articles
Information
The Canadian Entomologist , Volume 142 , Issue 5 , October 2010 , pp. 481 - 488
Copyright
Copyright © Entomological Society of Canada 2010

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