Acaricidal Effect of Momordica Charantia, Megaskepasma Erythrochlamys and Gliricidia Sepium on the Rhipicephalus Microplus

Abstract

Objective. The acaricidal activity of Momordica charantia (Mc), Megaskepasma erythrochlamys (Me) and Gliricidia sepium (Gs) on Rhipicephalus microplus (Rm) was evaluated. Materials and methods. Preliminary phytochemical analysis of leaves of the methanolic extract of Mc (EMc), the ethanolic extract of Me (EMe) and the acetone extract of Gs (EGs) were carried out through the technique of colorimetry and thin layer chromatography (CCD). The acaricidal activity was performed through in-vitro tests using the larval immersion test (LIT) and the adult immersion test (AIT). For in-situ tests, grazing cattle naturally infested with ticks were used, using the LC50obtained from the in-vitro AIT tests; subsequently engorged females were taken to incubation to assess their reproductive capacity Results. The presence of several groups of secondary metabolites of acaricidal interest was determined. The acaricidal effect of plants extracts on engorged females was demonstrated; although only EGs showed larvicidal activity. Extracts at 160 mg/mL affected the life cycle of Rm by inhibiting oviposition in 46.9%, 66.1% and 84.03% (p<0.05) for EGs, EMc and EMe, respectively. On the other hand, the in-situ testing, significant difference (p<0.05) was observed between EMc and EMe regarding control groups. Conclusions. The results obtained are promising to strengthen the possibility of linking the extracts of these plants within integrated plans to control ticks in cattle production systems.