Reference : Development of biological control formulations incorporating components of plant origin
Scientific congresses and symposiums : Paper published in a book
Life sciences : Entomology & pest control
Physical, chemical, mathematical & earth Sciences : Chemistry
Development of biological control formulations incorporating components of plant origin
Heuskin, Stéphanie mailto [Université de Liège - ULiège > Chimie et bio-industries > Chimie analytique >]
Lorge, Stéphanie [ > > ]
Verheggen, François mailto [Université de Liège - ULiège > Sciences agronomiques > Entomologie fonctionnelle et évolutive >]
Haubruge, Eric mailto [Université de Liège - ULiège > Services administratifs généraux > Vice-Recteur de Gembloux Agro Bio Tech - Entomologie fonctionnelle et évolutive >]
Mestdagh, Michèle [ > > ]
Wathelet, Jean-Paul mailto [Université de Liège - ULiège > Chimie et bio-industries > Chimie générale et organique >]
Lognay, Georges mailto [Université de Liège - ULiège > Chimie et bio-industries > Chimie analytique >]
Journée Scientifique annuelle de la Société Royale de Chimie: Jeudi 14 octobre 2010, Gembloux Agro-Bio Tech, Université de Liège, Chimie verte
Journée scientifique annuelle de la société royale de chimie - Chimie verte
14 octobre 2010
Société royale de chimie - Gembloux Agro-Bio Tech
[en] semiochemical ; aphids ; predators ; parasitoids ; essential oils ; formulation ; biological control ; E-beta-farnesene ; E-beta-caryophyllene
[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].
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