Effect of mahogany Khaya senegalensis seed oil in the control of Callosobruchus maculatus (Fab.) (Coleoptera: Bruchidae) on stored cowpea.

Abstract

<I>Khaya senegalensis</I> seed oil was evaluated for its efficacy in the control of <I>Callosobruchus maculatus</I> on stored cowpea. The oil was extracted locally from the dry <I>K. senegalensis</I> seeds. This was compared with Pirimiphos methyl E.C. as a standard. There was almost complete adult mortality of <I>C. maculatus</I> at 24 h after treatment with seed oil at 1, 2 and 3 ml/100 g of cowpea. The seed oil significantly reduced the F<SUB>1</SUB> and F<SUB>2</SUB> progeny emergence. The reduction in oviposition was not significant when compared with the control. The damage caused by <I>C. maculatus</I> was significantly reduced by <I>K. senegalensis</I> seed oil. For all the parameters examined, <I>K. senegalensis</I> seed oil showed no significant difference with Pirimiphos methyl E.C. in the control of <I>C. maculatus, </I>suggesting that <I>K. senegalensis</I> seed oil has high potential for use as botanical resource for control of <I>C. maculates.</I>