Optimisation of a semiochemical slow-release alginate formulation attractive towardsAphidius ervi Haliday parasitoids
(2011) pest management science — p. 1-10 (2011)
Files
Heuskin1.pdf
Restricted Access - Adobe PDF
- 293.52 KB
Details
- Authors
- Abstract
- 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 (0.5 M), 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.
- Affiliations
Department of Analytical Chemistry,Gembloux Agro-BioTech,University of Liege, Gembloux Department of General and Organic Chemistry, Gembloux Agro-Bio Tech, University of Liege, Gembloux Department of Analytical Chemistry,Gembloux ,Agro-BioTech University of Liege, Gembloux Agro-BioTech Department of Functional and Evolutionary Entomology, Gembloux Agro-Bio Tech, University of Liege, Gembloux Agro-Bio Tech Department of General and Organic Chemistry, Gembloux Agro-Bio Tech, University of Liege, Gembloux Agro-Bio Tech Department of Analytical Chemistry,Gembloux Agro-BioTech,University of Liege, Gembloux Agro-BioTech
Citations
Heuskin, S., Lorge, S., Godin, B., Leroy, P., Frere, I., Verheggen, F. J., Haubruge, E., Wathelet, J.-P., Mestdagh, M., Lognay, G., & Hance, T. (2011). Optimisation of a semiochemical slow-release alginate formulation attractive towardsAphidius ervi Haliday parasitoids. pest management science, 1-10. https://doi.org/10.1002/ps.2234 (Original work published 2011)