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Bioefficacy of Essential and Vegetable Oils of Zanthoxylum xanthoxyloides Seeds against Acanthoscelides obtectus (Say) (Coleoptera: Bruchidae)

Dongmo Fogang H.P., Womeni H.M., Piombo G., Barouh N., Tapondjou L.A.. 2012. Journal of Food Protection, 75 (3) : p. 547-555.

Experiments were conducted in the laboratory to evaluate the bioefficacy of essential and vegetable oils of Zanthoxylum xanthoxyloides (Rutaceae) against Acanthoscelides obtectus (Coleoptera: Bruchidae). The chemical composition of the essential oil and the fatty acid composition of the vegetable oil extracted from the seeds of Z. xanthoxyloides were determined. The insecticidal activities of these oils and the associated aromatized clay powder were evaluated against A. obtectus. Both oils were strongly repellent (100% repellency at 0.501 ml/cm2 essential oil and 3.144 ml/cm2 vegetable oil) and highly toxic (LC50 ~ 0.118 ml/cm2 for essential oil) to this beetle after contact on filter paper. The vapors of the essential oil were highly toxic to adult insects (LC50~0.044 ml/cm3), and the aromatized powder made from clay and essential oil was more toxic (LD50~0.137 ml/g) than the essential oil alone (LD50 ~ 0.193 ml/g) after 2 days of exposure on a common bean. Both oils greatly reduced the F1 insect production and bean weight loss and did not adversely affect the bean seed viability. In general, the results obtained indicate that these plant oils can be used for control of A. obtectus in stored beans. (Résumé d'auteur)

Mots-clés : phaseolus vulgaris; acide gras; efficacité; composition chimique; acanthoscelides obtectus; insecticide d'origine végétale; huile essentielle; zanthoxylum; cameroun

Thématique : Ravageurs des plantes; Traitement des produits agricoles non alimentaires

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