Journal of
Stored Products and Postharvest Research

  • Abbreviation: J. Stored Prod. Postharvest Res.
  • Language: English
  • ISSN: 2141-6567
  • DOI: 10.5897/JSPPR
  • Start Year: 2010
  • Published Articles: 166

Full Length Research Paper

Orange peel powder and cypress ash affecting bean weevil (Acanthoscelides obtectus) and preserving seed viability

Katamssadan Haman Tofel
  • Katamssadan Haman Tofel
  • Department of Phytosanitary Protection, ISABEE, The University of Bertoua, Cameroon.
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Divine Nsobinenyui
  • Divine Nsobinenyui
  • Department of Applied Zoology, Faculty of Science, The University of Bamenda, Cameroon.
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Linus Nkwain
  • Linus Nkwain
  • Department of Crop Production Technology, COLTECH, The University Bamenda, Cameroon.
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Wini Jean Goudoungou
  • Wini Jean Goudoungou
  • Department of Applied Zoology, Faculty of Science, The University of Bamenda, Cameroon.
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Elias Nchiwan Nukenine
  • Elias Nchiwan Nukenine
  • Department of Biological Sciences, Faculty of Science, The University of Ngaoundere, Cameroon.
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  •  Received: 13 July 2023
  •  Published: 31 January 2024


Common bean Phaseolus vulgaris is highly attacked during storage by Acanthoscelides obtectus which reduces seeds quantity, quality and germination rate. Due to the hazards of synthetic chemicals to humans and the environment, there is a need to promote the application of phytochemicals. Orange peel powder, cypress leaf ash and their mixture were assessed against A. obtectus and to determine their influence on seed germination. Four concentrations (5, 10, 20 and 30 g/kg) of the botanicals were applied. Analysis of essential oil extracted from Citrus sinensis revealed limonene as the main volatile (90.77%). Orange peel powder was less effective against A. obtectus with 12.5 % mortality at the content of 30 g/kg within 5 days post exposure. Cypress ash and its combination with orange peel powder recorded 98% and 86% mortality respectively within the same period. The tested formulations were effective in inhibiting F1 progeny thereby leading to less grain damage and weight loss. In addition, there was no significant effect of botanicals on stored seeds about the germination rate. Both plant products could be a major component for the protection of beans against A. obtectus attacks because it is easy to wash the treated seeds to remove residue of botanicals.

Key words: Botanicals, bioactivity, Acanthoscelides obtectus, common beans, germination.