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This experiment aimed to investigate the chemical composition and the acaricidal and larvicidal activities of essential oil (EO) and fractions from rose pepper (Schinus terebinthifolius (Raddi) leaves against Rhipicephalus (Boophilus) microplus. The EO was obtained from fresh leaves of adult rose pepper specimens by hydrodistillation (2h), then fractioned by column chromatography and analyzed by gas chromatography coupled to mass spectrometry (GC/MS). The acaricidal activity was determined by Adult Immersion Test (AIT) and Larval Packet Test (LPT). The concentrations of EO for AIT were from 500.00 to 0.19 mg/mL, and for LPT were from 12.50 to 0.00018 mg/mL. The mortality percentage (%) of female and larvae ticks were obtained by calculating the average ± standard error utilizing the Microsoft Excel® program. The data were submitted to analysis of variance (ANOVA) and compared utilizing Sisvar 5.6 program by Scott-Knott’s test (p<0.05). The values of lethal concentration (LC50 and LC99.9) and their respective confidence intervals (CI) were calculated by Probit analysis. Bioassays showed that EO from leaves killed 40.00% of the females and inhibited 97.06% of egg hatchability at the dose of 500.00 mg/mL, and high activity on larvae, presenting LC50 0.0026 ± 0.0004 mg/mL and LC99.9 of 8.58 ± 0.03 mg/mL. The probable action mechanism of EO and fractions was established by the bioautographic method, measuring the inhibition potential on the acetylcholinesterase enzyme, indicating an inhibition until the concentration of 0.0003 mg/mL. These results allow new perspectives to propose new biomolecules as a way to minimize tick resistance against conventional acaricides.

australian journal of crop science

Acaricidal and larvicidal activity of leaves and fractions of rose pepper (Schinus terebinthifolius Raddi. (Anacardiaceae) essential oil against Rhipicephalus (Boophilus) microplus