Repellent effects of powder and extracts of leaf and root bark of Calotropis procera and Parquetina nigrescens on Callosobruchus maculatus (F). (Coleoptera: Chrysomelidae)
Alamuoye Nathaniel O
This study assessed the efficacy of powder and solvent extracts of the leaf and root bark of Calotropis procera and Parquetina nigrescens to repel Callosobruchus maculatus. This was with a view to developing a botanical based repellant for the control of bean weevil in cowpea storage. The powder and solvent extracts of leaf and root bark of C. procera and P. nigrescens were prepared and different concentrations of the powder and solvent extract of the plant materials used for repellency tests of C. maculatus. The results showed that the powder of C. procera and P. nigrescens leaf repelled higher number of insects than the powder of C. procera and P. nigrescens root bark, whilerepellency was generally higher in ethanolic extract of C. procera leaf and root bark than the methanolic extracts of C. procera leaf and root bark. There was significant difference (P< 0.05) in the number of insects repelled at every concentration. In conclusion, the study shows that the leaf and root bark of C. procera and P. nigrescens contain relative repellency properties that could be used in the control of infestation of cowpea seeds by C. maculatus.