African Journal of
Agricultural Research

  • Abbreviation: Afr. J. Agric. Res.
  • Language: English
  • ISSN: 1991-637X
  • DOI: 10.5897/AJAR
  • Start Year: 2006
  • Published Articles: 6638

Full Length Research Paper

Efficacy of oils and powders of some medicinal plants in biological control of the pea weevil (Callosobruchus chinensis L.)

A. F. Righi-Assia1, M. A. Khelil2, F. Medjdoub-Bensaad3* and K. Righi1
1Laboratory of Research of biological Systems and Geomatic, Department of Agronomy, University of Mascara 29000, Algeria. 2Laboratory of valorization of the man's actions for the protection of the environment and application in public health, Faculty of the Sciences, University of Tlemcen 13000, Algeria. 3Laboratory of Entomology, Department of Biology, Faculty of the Biologic Sciences and the Agronomic Science, University Mouloud Mammeri, Tizi-Ouzou 15000, Algeria.
Email: [email protected]

  •  Published: 18 June 2010

Abstract

Each year, the chickpea suffer’s from significant losses in both quantity and quality. These losses are observed particularly in stocks, which are principally due to attacks by weevils. The most devastating is the Chinese weevil (Callosobruchus chinensis). In the context of biological control as an alternative to chemical control, three plants were tested for their possible role organic insecticide, namely Thymus vulgarusSantolina chamaecyparissus and Anagyris foetida. The leaf powders and oils of these plants that was extracted by hydro distillation were tested for their effect on the biology of C. chinensis such asfertility, longevity and sex ratio. The results showed that oils and powders of three different plants tested possess insecticidal activity against C. chinensis. By comparing these oils, Thyme oil at a dose of 10 μl exhibited great biocidal power against insects as we experienced 100% mortality after only hours of exposure to treatment, hard tan l 'oil santolina also had 100% mortality but at a dose of 20 μl. Regarding the powder, that of Santoline when compared to other powders at a dose of 1 g significantly reduces longevity (2.9 days), fecundity (3.06) and fertility (3.33). It even has an ovicidal effect. For 10 repetitions, we have recorded a single outbreak. This allows us to move forward so that the oils and powders tested plants can be used as bio insecticide for control of C. chinensis populations of pests of stored foodstuffs.

 

Key words: Callosobruchus chinensisCicer arietinumThymus vulgarus,Santolina chamaecyparissusAnagyris foetida and bio-insecticide.