ORBi: Durieux Delphine - Factors involved in the aggregation of Harmonia axyridis Pallas

Reference : Factors involved in the aggregation of Harmonia axyridis Pallas


	Document type :	Scientific congresses and symposiums : Unpublished conference
	Discipline(s) :	Life sciences : Entomology & pest control
	To cite this reference:	http://hdl.handle.net/2268/123218

Title :	Factors involved in the aggregation of Harmonia axyridis Pallas
Language :	English
Author, co-author :	Durieux, Delphine [Université de Liège - ULg > Sciences agronomiques > Entomologie fonctionnelle et évolutive >]
	Fischer, Christophe [Université de Liège - ULg > Chimie et bio-industries > Analyse, qual. et risques - Labo. de Chimie analytique >]
	Deneubourg, Jean-Louis [Université Libre de Bruxelles - ULB > Ecologie sociale > > >]
	Brostaux, Yves [Université de Liège - ULg > Sciences agronomiques > Statistique, Inform. et Mathém. appliquée à la bioingénierie >]
	Lognay, Georges [Université de Liège - ULg > Chimie et bio-industries > Analyse, qual. et risques - Labo. de Chimie analytique >]
	Vandereycken, Axel [Université de Liège - ULg > Sciences agronomiques > Entomologie fonctionnelle et évolutive >]
	Joie, Emilie [Université de Liège - ULg > Sciences agronomiques > Entomologie fonctionnelle et évolutive >]
	Haubruge, Eric [Université de Liège - ULg > Services administratifs généraux > Vice-Recteur de Gembloux Agro Bio Tech >]
	Verheggen, François [Université de Liège - ULg > Sciences agronomiques > Entomologie fonctionnelle et évolutive >]
Publication date :	22-May-2012
Audience :	International
Event name :	64th International Symposium on Crop Protection
Event date :	22nd May 2012
Event place (city) :	Ghent
Event country :	Belgium
Keywords :	[en] area marking ; invasive species ; contact pheromone ; social behaviour ; group effect ; shelter luminosity
Abstract :	[en] In order to survive cold winters, the invasive multicoloured Asian ladybeetle, Harmonia axyridis Pallas (Coleoptera: Coccinellidae) forms large aggregations in dwellings to overwinter. The factors involved in the selection of aggregation sites remain misunderstood. The work presented herein focussed on the study of the chemical compounds involved in this phenomenon. Chemical and behavioural analyses highlighted that long-chain hydrocarbons lead congeners towards aggregation sites and ensure the cohesion of the cluster. Subsequently, physical factors were investigated. We studied the influence of (1) the density of individuals and (2) the quality of available shelters on H. axyridis decision to settle and aggregate under shelters. A binary choice experiment conducted in laboratory showed that the multicoloured Asian ladybeetles present a permanent aggregative behaviour, even during non-wintering conditions. These experiments also highlighted the existence of social interactions between individuals. All these results contribute to improve knowledge of this behaviour in H. axyridis and could be used in the design of species-specific traps in order to control infestations in dwellings.
Funders :	Fonds pour la formation à la Recherche dans l'Industrie et dans l'Agriculture (Communauté française de Belgique) - FRIA
Target :	Researchers ; Professionals ; Students ; General public
Permalink :	http://hdl.handle.net/2268/123218

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