Chemical composition and insecticidal activity of Xylopia aethiopica (Dunal) A. Rich (Annonaceae) essential oil on Callosobruchus maculatus : Composition chimique et activité insecticide de l’huile essentielle des fruits de Xylopia aethiopica (Dunal) A. Rich (Annonaceae) sur Callosobruchus maculatus

Steam distillation of Xylopa aethiopica (Annonaceae) dried fruits collected at Badou in Akposso region (Togo) gave a colourless essential oil with an overall yield of 3.5% (dry matter). From GC and GC/MS analysis 43 components were identified which represented more than 95% of the essential oil composition. The major components are found to be β-pinene (31.92%), germacrene-D (13.04%), α-pinene (10.28%), sabinene (7.88%), 1,8-cineole (4.87%). Xylopa aethiopica essential oil had a strong and interesting insecticidal activity against Callosobruchus maculatus a major cowpea stored products pest. With dose of 7µL/L of essential oil, more than 98% mortality of weevil was observed after 24 hours of application.