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

Abstract

Khaya senegalensis seed oil was evaluated for its efficacy in the control of Callosobruchus maculatus on stored cowpea. The oil was extracted locally from the dry K. senegalensis seeds. This was compared with Pirimiphos methyl E.C. as a standard. There was almost complete adult mortality of C. maculatus at 24 h after treatment with seed oil at 1, 2 and 3 ml/100 g of cowpea. The seed oil significantly reduced the F1 and F2 progeny emergence. The reduction in oviposition was not significant when compared with the control. The damage caused by C. maculatus was significantly reduced by K. senegalensis seed oil. For all the parameters examined, K. senegalensis seed oil showed no significant difference with Pirimiphos methyl E.C. in the control of C. maculatus, suggesting that K. senegalensis seed oil has high potential for use as botanical resource for control of C. maculates.

Keywords

• k. senegalensis seed oil
• pirimiphos methyl e.c.
• c. maculates
• cowpea grains
• bioassay