First Report on Chemical Composition and Acaricidal Activity on the Cattle Tick <i>Rhipicephalus microplus</i> of Essential Oil from <i>Monanthotaxis parvifolia</i> (Oliv.) Verdc

Abstract

Abstract:The chemical composition of the essential oil obtained by hydrodistillation from leaves of Monanthotaxis parvifolia were analyzed by GC and GC/MS. Thirty compounds representing 99.9 % of oil were identified. This oil is rich in sesquiterpenes with oxygenated sesquiterpenes (87.1%) following by hydrocarbons compounds (10.8%). Caryophyllene oxide (50.5%), 14-hydroxy-9-epi-(E)-caryophyllene (7.6%) and β-eudesmol (7.3%) were the main components. The acaricidal activity of this oil against Rhipicephalus microplus was assessed by modified Larval Packet Test (LPT) and Adult Immersion Test (AIT) with oil concentrations of 5%, 10% and 20% (v/v). Mortality percentages of larvae were 89.51%, 82.18% and 75.01% respectively at 20%, 10% and 5% dilutions. Monanthotaxis parvifolia leave's essential oil has considerably reduced egg laying and induced a low reproductive index (0.067%) at 20% dilution.