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

The use of two indigenous medicinal plant leaf powders (Cymbopogon citratus and Ocimum suave) applied as mixed and individual powders to evaluate the reproductive fitness of F1 generation (eggs laid and F2 adult) of Callosobruchus maculatus (cowpea bruchid)

Ojianwuna, C. C
  • Ojianwuna, C. C
  • Department of Animal and Environmental Biology, Delta State University, Abraka, Delta State, Nigeria
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Umoru, P. A
  • Umoru, P. A
  • Department of Zoology, Ambrose Alli University, Ekpoma, Edo State, Nigeria.
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  •  Accepted: 21 December 2011
  •  Published: 16 January 2012


It has been estimated that over 90% cowpea is lost to cowpea bruchids especiallyCallosobruchus maculatus. A mixture of plant containing Cymbopogon citratus (Lemon grass) (L) and Ocimum suave (Wild basil) (W) powders in the ratios (Lemon grass: Wild basil): 100:0, 80:20, 60:40, 50:50, 40:60, 20:80, 0:100 and 0:0 were used under ambient laboratory conditions with the aim of evaluating the effects of these plant powders on the reproductive fitness of F1generation of C. maculatus (F.) (Cowpea bruchids). The mixed powders were each applied at 1, 2, and 3 g concentration to 20 g of cowpea seeds. Number of eggs laid by F1 and subsequent F2 adult that emerged from the untreated combination were compared with the untreated control (0L: 0W). The plant mixture 60L: 40W had the least mean number of egg counts and significantly (P<0.05) suppressed F2 adult emergence. This plant material mixture had the most knock on effect from the original parent and this shows that it can serve as grain protectants against C. maculatus.


Key wordsCymbopogon citratus, Ocimum suave, Callosobruchus maculatus, F1, F2generation adults.