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Evidence of sexual attraction by pheromone in the cedar web-spinning sawfly

Published online by Cambridge University Press:  02 April 2012

Nabil Nemer ,
Nasri S. Kawar ,
Linda Kfoury  and
Brigitte Frerot
Nabil Nemer
Affiliation:
American University of Beirut, Faculty of Agricultural and Food Sciences, Department of Plant Sciences, P.O. Box 11-0236, Riad El Solh 1107 2020, Beirut, Lebanon
Nasri S. Kawar
Affiliation:
American University of Beirut, Faculty of Agricultural and Food Sciences, Department of Plant Sciences, P.O. Box 11-0236, Riad El Solh 1107 2020, Beirut, Lebanon
Linda Kfoury
Affiliation:
Lebanese University, Faculty of Agriculture, P.O. box 13-5368, Beirut, Lebanon
Brigitte Frerot*
Affiliation:
Physiologie de l'Insecte Signalisation et Communication, Unité Mixte de Recherche 1272, Institut National de la Recherche Agronomique (INRA), route de St-Cyr, 78026 Versailles CEDEX, France
*
1Corresponding author (e-mail: frerot@versailles.inra.fr).
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Abstract

The cedar web-spinning sawfly, Cephalcia tannourinensis Chevin (Hymenoptera: Pamphiliidae), is a pest that has been causing serious damage to cedar (Cedrus libani) forests in Lebanon since 1990. The existence of a sex pheromone was shown in field experiments in a cedar forest in Lebanon and in laboratory tests in olfactometers with and without airflow. More males were caught in traps baited either with virgin females or with a hexane extract of the whole female body than in traps baited either with males alone or with mixed males and females. Male and female C. tannourinensis were active during the day. Mating and pheromone production were observed to occur during midday hours (1000–1400) in the field and under laboratory conditions. Olfactometer tests with extracts prepared from different body parts of the female indicated that the pheromone is produced in the abdominal region, and tests with different dilutions of female extract showed that the male response is dose-dependent.

Résumé

La thendrède du cèdre, Cephalcia tannourinensis Chevin (Hymenoptera : Pamphiliidae), cause de graves dommages dans les cédraies libanaises (Cedrus libani) depuis 1990. Des études menées sur le terrain par piégeage sexuel et au laboratoire par olfactométrie ont permis de mettre en évidence l'existence d'une phéromone sexuelle produite par les femelles et attractive pour les mâles. Les mêmes tests ont démontré que l'activité sexuelle est diurne et limitée à un moment de la journée qui se situe entre 1000 h et 1400 h; que la phéromone est extractible dans l'hexane et que l'abdomen serait le siège de la production. La réponse des mâles est dépendante de la dose.

Type
Articles
Information
The Canadian Entomologist , Volume 139 , Issue 5 , October 2007 , pp. 713 - 721
Copyright
Copyright © Entomological Society of Canada 2007

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