Effet comparé des huiles essentielles de quatre espèces végétales contre la bruche du niébé (Callosobruchus maculatus Fab.) et le charançon du riz (Sitophilus oryzae L)

Abstract

Compared Effect of Four Plant Essential Oils against Cowpea Weevil Callosobruchus maculatus Fab. and Rice Weevil Sitophilus oryzae L. The aim of this paper is to compare the essential oil effects of Eucalyptus tereticornis Sm., Eucalyptus citriodora Hook, Citrus sinensis (L.) Obs.) and Ocimum basilicum L. against the cowpea weevil (Callosobruchus maculatus Fab.) and the rice weevil (Sitophilus oryzae L). The experiments were conducted in laboratory, in Petri dishes. As nutritive support, we used cowpea and maize grains for respectively C. maculatus and S. oryzae. The Petri dish bottom had a filter paper impregnated with a desired essential oil quantity. The obtained results showed that the tested essential oils were not efficient against S. oryzae. On the other hand, the essential oils of E. citriodora and O. basilicum were very efficient against C. maculatus. The respective LD 50 was 1.26 ml and 1.49 ml in acetone dilution of 2 %.

Keywords

• Essential Oils
• Cowpea Weevil
• Rice Weevil