ORBi: Heuskin Stéphanie - Optimisation of a semiochemical slow-release alginate formulation attractive towards Aphidius ervi Haliday parasitoids

Reference : Optimisation of a semiochemical slow-release alginate formulation attractive towards Aph...


	Document type :	Scientific journals : Article
	Discipline(s) :	Life sciences : Entomology & pest control Physical, chemical, mathematical & earth Sciences : Chemistry
	To cite this reference:	http://hdl.handle.net/2268/87307

Title :	Optimisation of a semiochemical slow-release alginate formulation attractive towards Aphidius ervi Haliday parasitoids
Language :	English
Author, co-author :	Heuskin, Stéphanie [Université de Liège - ULg > Chimie et bio-industries > Chimie analytique >]
	Lorge, Stéphanie [ > > ]
	Godin, Bruno [ > > ]
	Leroy, Pascal [Université de Liège - ULg > Sciences agronomiques > Entomologie fonctionnelle et évolutive >]
	Frère, Isabelle [ > > ]
	Verheggen, François [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 >]
	Wathelet, Jean-Paul [Université de Liège - ULg > Chimie et bio-industries > Chimie générale et organique >]
	Mestdagh, Michèle [ > > ]
	Hance, Thierry [ > > ]
	Lognay, Georges [Université de Liège - ULg > Chimie et bio-industries > Chimie analytique >]
Publication date :	Jul-2011
Journal title :	Pest Management Science
Publisher :	John Wiley & Sons Ltd.
Peer reviewed :	Yes (verified by ORBi)
Audience :	International
ISSN :	1526-498X
Keywords :	[en] semiochemical ; biological control ; alginate beads ; slow-release ; aphids ; Aphidius ervi
Abstract :	[en] BACKGROUND: Optimisation of alginate formulations is described in order to develop semiochemical (E-β-farnesene and E-β-caryophyllene) slow-release devices in biological control approaches by attracting predators and parasitoids of aphids. Various formulation criteria were optimised with respect to semiochemical encapsulation capacity. Moreover, the optimised formulation was characterised by texturometry and confocal microscopy. The slow-release rates of semiochemicals were calculated in laboratory controlled conditions. The attractiveness of semiochemical formulations towards Aphidius ervi was demonstrated by olfactometry. RESULTS: Two major parameters were highlighted in encapsulation optimisation: the type of alginate (Sigma L) and the type of crosslinker ion (Ca2+). Other formulation parameters were optimised: ionic strength (0.5M), Ca2+ (0.2 M) and alginate (1.5%) concentrations and the maturation time of beads in CaCl2 solution (48 h). After physical characterisation of beads, semiochemical slow-release measurements showed that alginate formulations were efficient sesquiterpene releasers, with 503 μg of E-β-farnesene and 1791 μg of E-β-caryophyllene totally released in 35 days. The efficiency of semiochemical alginate beads as attractants for female parasitoids was demonstrated, with high percentages of attraction for semiochemical odours (88 and 90% for E-β-farnesene and E-β-caryophyllene respectively) and significant statistical results. CONCLUSION: Semiochemical alginate beads can be considered as efficient slow-release systems in biological control. These formulations could be very useful to attract aphid parasitoids on crop fields.
Funders :	Waleo2
Name of the research project :	SOLAPHID
Target :	Researchers ; Professionals ; Students
Permalink :	http://hdl.handle.net/2268/87307
DOI :	10.1002/ps.2234

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