Potencial acaricida do extrato de folhas de Xylopia emarginata Mart. contra larvas de Rhipicephalus microplus

Abstract

The objective of this work was to evaluate the in vitro carrapaticidal action of ethanol extract (EE) of Xylopia emarginataleaves Mart.com different tannin contents on R. microplus larvae. For this, as leaves of X. emarginata were collected monthly during the period of 12 months to evaluate the production of tannins through the solveylysis technique catalyzed by butanol/HCl. To evaluate the efficacy of EE, the larvae bundle test (TPL) was performed with reading in the interval of 24 hours of incubation using concentrations of 25 to 100 mg mL-1, the negative control containing distilled water and the positive control containing chemical carrapaticide. It was observed that the EE containing 5.9% tannin content promoted 80.44% mortality at the concentration of 100 mg mL-1. The EE containing 13.2% tannin content promoted 97.43% mortality at 100 mg mL-1. Thus, high larvicidal activity of ethanol extracts of leaves of X. emarginata on Larvae of R. microplus was verified and this activity may be related to tannin contents.