Reference : Development of semiochemical slow-release formulations as biological control devices
Scientific congresses and symposiums : Poster
Life sciences : Entomology & pest control
Physical, chemical, mathematical & earth Sciences : Chemistry
http://hdl.handle.net/2268/129048
Development of semiochemical slow-release formulations as biological control devices
English
Heuskin, Stéphanie mailto [Université de Liège - ULg > Chimie et bio-industries > Analyse, qual. et risques - Labo. de Chimie analytique >]
Lorge, Stéphanie mailto [Université de Liège - ULg > > Gembloux Agro-Bio Tech >]
Leroy, Pascal [Université de Liège - ULg > Sciences agronomiques > Entomologie fonctionnelle et évolutive >]
Verheggen, François mailto [Université de Liège - ULg > Sciences agronomiques > Entomologie fonctionnelle et évolutive >]
Wathelet, Jean-Paul mailto [Université de Liège - ULg > Chimie et bio-industries > Chimie générale et organique >]
Haubruge, Eric mailto [Université de Liège - ULg > Services administratifs généraux > Vice-Recteur de Gembloux Agro Bio Tech >]
Lognay, Georges mailto [Université de Liège - ULg > Chimie et bio-industries > Analyse, qual. et risques - Labo. de Chimie analytique >]
Jul-2012
Yes
No
International
International Society of Chemical Ecology, 28th Annual Meeting
22 juillet au 26 juillet 2012
ISCE
Vilnius
Lituanie
[en] semiochemicals ; sesquiterpenes ; E-beta-farnesene ; E-beta-caryophyllene ; alginate ; formulations ; slow-release ; biological control ; aphids ; predators ; parasitoids
[en] Semiochemicals have been widely considered within various integrated pest management (IPM) strategies. In the present work, two sesquiterpenoids, E-β-farnesene and E-β-caryophyllene, were formulated for their related properties as aphid enemy attractants. E-β-farnesene, the alarm pheromone of many aphid species, was also identified as a kairomone of aphid predators (Episyrphus balteatus De Geer (Diptera: Syrphidae)) and parasitoids (Aphidius ervi Haliday (Hymenoptera: Braconidae)). E-β-caryophyllene was identified as a potential component of the aggregation pheromone of the Asian ladybird, Harmonia axyridis Pallas, another aphid predator. The two products were purified from essential oils of Matricaria chamomilla L. (Asteraceae) and Nepeta cataria L. (Lamiaceae) for E-β-farnesene and E-β-caryophyllene, respectively. Natural and biodegradable slow-release formulations were then investigated in order to deliver these molecules on crop fields for a long period of time as biological control devices. Due to their sensitivity to oxidation, both sesquiterpenes needed to be protected from degradation. For this purpose, alginate – hydrophilic matrix with low oxygen permeability – was used as polymer for the formulations: the main objective was to deliver semiochemical substances in the air in a controlled way. Consequently, a careful selection of alginates was realised. Formulated beads showed different structural and encapsulation properties depending on various formulation factors. Alginate formulations were characterized by texturometry and by confocal microscopy in order to observe the distribution of semiochemicals in alginate network. The last step of alginate bead characterisation consisted in studying release rate of semiochemicals in laboratory-controlled conditions by optimised trapping and validated Fast-GC procedures. Finally, the efficiency of formulations as aphid predator (Syrphidae) and parasitoid (A. ervi) attractants was demonstrated by field trapping and olfactometry experiments.
Researchers ; Professionals ; Students
http://hdl.handle.net/2268/129048

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