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

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Abstract:

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 μl/cm2 essential oil and 3.144 μl/cm2 vegetable oil) and highly toxic (LC50 = 0.118 μl/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 μl/cm3), and the aromatized powder made from clay and essential oil was more toxic (LD50 = 0.137 μl/g) than the essential oil alone (LD50 = 0.193 μl/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.

Document Type: Research Article

DOI: http://dx.doi.org/10.4315/0362-028X.JFP-11-136

Affiliations: 1: Laboratory of Environmental and Applied Chemistry, Faculty of Science, University of Dschang, P.O. Box 183, Dschang, Cameroon, Laboratory of Biochemistry of Medicinal Plants, Food Science and Nutrition, Faculty of Science, University of Dschang, P.O. Box 67, Dschang, Cameroon 2: Laboratory of Biochemistry of Medicinal Plants, Food Science and Nutrition, Faculty of Science, University of Dschang, P.O. Box 67, Dschang, Cameroon 3: Laboratoire de Lipotechnie, UMR IATE, CIRAD, TA 40/16, 73 rue JF Breton, 34398 Montpellier cedex 5, France 4: Laboratory of Environmental and Applied Chemistry, Faculty of Science, University of Dschang, P.O. Box 183, Dschang, Cameroon;, Email: tapondjou2001@yahoo.fr

Publication date: March 1, 2012

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