African Journal of
Biotechnology

  • Abbreviation: Afr. J. Biotechnol.
  • Language: English
  • ISSN: 1684-5315
  • DOI: 10.5897/AJB
  • Start Year: 2002
  • Published Articles: 12487

Full Length Research Paper

Contribution of different constituents to the toxicity of the essential oil constituents of Vernonia amygdalina (Compositae) and Xylopia aetiopica (Annonaceae) on maize weevil, Sitophilus zeamais Motschulsky (Coleoptera: Curculionidae)

Asawalam E. F1, 2*, Emosairue S. O2 and Hassanali A.1
1Behavioural and Chemical Ecology Department, International Centre of Insect Physiology and Ecology P. O. Box 30772-00100 Nairobi, Kenya. 2Department of Plant Health Management Michael Okpara University of Agriculture, Umudike P. M. B. 7267 Umuahia, Abia state Nigeria.
Email: [email protected], [email protected]

  •  Accepted: 12 March 2008
  •  Published: 18 August 2008

Abstract

The lethal toxicity of the major constituent of the essential oils of Vernonia amygdalina and Xylopia aetiopica, and of selected blends of these againstSitophilus zeamais (Motschulsky) (Coleoptera: Curculionidae) was compared with those of the full blends of the essential oils. The compounds were assayed in amounts and proportions present in the minimum 100% lethal dose of the essential oils. The major component of X. aetiopica was found to be largely responsible for the toxic action of its essential oil against S. zeamais, On the other hand the toxic action of V. amygdalina was due to the combined effects of its constituents, either with or without significant individual toxic action of their own against the insects. The implication of these results and their implication in screening and using plants and their phytochemicals for S. zeamais control is highlighted.

 

Key words: Vernonia amygdalina, Xylopia aetiopica, essential oils, Sitophilus zeamais, synergism.

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This article is published under the terms of the Creative Commons Attribution License 4.0

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