ORBi: Heuskin Stéphanie - Development of biological control formulations incorporating components of plant origin

Reference : Development of biological control formulations incorporating components of plant origin


	Document type :	Scientific congresses and symposiums : Paper published in a book
	Discipline(s) :	Life sciences : Entomology & pest control Physical, chemical, mathematical & earth Sciences : Chemistry
	To cite this reference:	http://hdl.handle.net/2268/75888

Title :	Development of biological control formulations incorporating components of plant origin
Language :	English
Author, co-author :	Heuskin, Stéphanie [Université de Liège - ULg > Chimie et bio-industries > Chimie analytique >]
	Lorge, Stéphanie [ > > ]
	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 - Entomologie fonctionnelle et évolutive >]
	Mestdagh, Michèle [ > > ]
	Wathelet, Jean-Paul [Université de Liège - ULg > Chimie et bio-industries > Chimie générale et organique >]
	Lognay, Georges [Université de Liège - ULg > Chimie et bio-industries > Chimie analytique >]
Publication date :	14-Oct-2010
Main document title :	Journée Scientifique annuelle de la Société Royale de Chimie: Jeudi 14 octobre 2010, Gembloux Agro-Bio Tech, Université de Liège, Chimie verte
Audience :	National
Event name :	Journée scientifique annuelle de la société royale de chimie - Chimie verte
Event date :	14 octobre 2010
Event organizer :	Société royale de chimie - Gembloux Agro-Bio Tech
Event place (city) :	Gembloux
Event country :	Belgium
Keywords :	[en] semiochemical ; aphids ; predators ; parasitoids ; essential oils ; formulation ; biological control ; E-beta-farnesene ; E-beta-caryophyllene
Abstract :	[en] Semiochemicals – informative molecules used in insect-insect or plant-insect interactions – have been considered within various integrated pest management IPM strategies. Herein, two sesquiterpenoids: E-β-farnesene and E-β-caryophyllene have been formulated for their potential properties as aphid enemies attractants. Indeed, E-β-farnesene, the alarm pheromone of many aphid species [1], has also been identified as a kairomone by attracting and inducing oviposition of aphid predators (Episyrphus balteatus De Geer (Diptera: Syrphidae)) [2-5] and by attracting aphid parasitoids (Aphidius ervi Haliday (Hymenoptera: Braconidae)) [6, 7]. E-β-caryophyllene was identified as a potential component of the aggregation pheromone of the Asian ladybird, Harmonia axyridis Pallas [8, 9]. The two products have been purified from essential oils of Matricaria chamomilla L. (Asteraceae) and Nepeta cataria L. (Lamiaceae) [10, 11]. Natural and biodegradable slow-release devices have been investigated in order to deliver these molecules. Moreover, due to their sensitivity to oxidation, the sesquiterpenes needed to be protected. For this purpose, alginate (hydrophilic matrix with low oxygen permeability) was used as polymer for the formulations: the main objective was to hold and deliver semiochemical substances in a controlled way. Consequently, a careful selection of alginates was realised for encapsulation. Formulated beads showed different structural and encapsulation properties depending on factors such as polymer concentration, ionic strength, type and concentration of cross-linker ion,... The gel structure influenced diffusion properties. Alginate formulations were characterized by texturometry and by confocal microscopy in order to observe the distribution of semiochemicals in alginate network. The last step consisted in studying release rate of semiochemicals in laboratory-controlled conditions by adapted trapping and Fast-GC procedures [10,11].
Target :	Researchers ; Professionals ; Students
Permalink :	http://hdl.handle.net/2268/75888

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