Efeito acaricida in vitro do extrato hidroalcoólico de Himatanthus sucuuba contra Rhipicephalus microplus.

The aim of this study was to evaluate the in vitro efficacy of the Himatanthus sucuuba hydroalcoholic extracts against larvae and engorged female of Rhipicephalus microplus. The extracts were prepared by percolation from latex, stems and leaves in absolute alcohol and lyophilized. We performed the larval packet test, LPT in serial concentrations (0.4 - 204.8 mg.mL-1) and adult immersion test, AIT (6.4-396.8 mg.mL-1) using six replicates. The complete phytochemical composition was determined to all the extracts. From the LPT and TIA, the latex demonstrated the best results, with an LD50 of 21.4 and 105.2 mg.mL-1, respectively. The phytochemical data, combined with the dose-dependent results obtained from the in vitro tests demonstrates that this extract has potential to control R. microplus. Further studies should be conducted to maximize the effectiveness of the latex portion of the plant. [ABSTRACT FROM AUTHOR]