Reference : What makes Episyrphus balteatus (Diptera: Syrphidae) oviposit on aphid infested tomato p...
Scientific journals : Article
Life sciences : Entomology & pest control
Life sciences : Agriculture & agronomy
http://hdl.handle.net/2268/20859
What makes Episyrphus balteatus (Diptera: Syrphidae) oviposit on aphid infested tomato plants?
English
Verheggen, François mailto [Université de Liège - ULg > Gembloux Agro-Bio Tech > Gembloux Agro-Bio Tech >]
Capella, Quentin [Université de Liège - ULg > Gembloux Agro-Bio Tech > Gembloux Agro-Bio Tech >]
Wathelet, Jean-Paul [Université de Liège - ULg > Gembloux Agro-Bio Tech > Gembloux Agro-Bio Tech >]
Haubruge, Eric [Université de Liège - ULg > Gembloux Agro-Bio Tech > Gembloux Agro-Bio Tech >]
2008
Communications in Agricultural and Applied Biological Sciences
73
3
371-81
Yes (verified by ORBi)
International
1379-1176
[en] Animals ; Aphids/pathogenicity ; Arthropods/pathogenicity/physiology ; Diptera/pathogenicity/physiology ; Female ; Lycopersicon esculentum/parasitology ; Mollusca/parasitology/physiology ; Oviposition ; Vicia faba/parasitology
[en] Under attack by insect pests, many plant species change their volatile chemical emissions to attract natural enemies. Most of the tomato (Lycopersicon sp., Solanaceae) varieties are subjected to infestation by molluscs and insects, including the generalist aphid Myzus persicae Sulzer (Homoptera, Aphididae). Episyrphus balteatus De Geer (Diptera: Syrphidae) is a generalist aphid predator that was here observed to lay eggs on M. persicae infested tomato but not on non-infested plants. In order to identify the volatile chemicals that guide the foraging and oviposition behaviour of E. balteatus, we collected and identified volatiles released in the headspace of both aphid infested and uninfested tomato plants by SPME-GC-MS. The identified chemicals were subsequently tested by electroantennography (EAG) on E. balteatus. Monoterpenes and sesquiterpenes were identified, the main volatile chemicals being beta-phellandrene, 2-carene, alpha-phellandrene, 3-carene and o-pinene. Electrical depolarizations were observed for each tested monoterpene, with optimal responses ranging from -0.2 to -0.8 mV. Episyrphus balteatus antennae showed dose-response relationships towards all the active chemicals. (E)-beta-farnesene, the main component of the aphid alarm pheromone, was the only active sesquiterpene, and is presumed to act as an oviposition stimulus for E. balteotus.
http://hdl.handle.net/2268/20859

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