Atividade acaricida de amburana cearensis frente ao rhipicephalus (boophilus) microplus

Abstract

This experiment was carried out to study the bioacaricidal activity of Amburana cearensis against engorgedfemales of Rhipicephalus (Boophilus) microplus. The crudeethanolic extract from the leaves of A. cearensis was submittedto partition with organic solvents (hexane, chloroform and ethylacetate) in order of increasing polarity; and evaluated using threetreatments at concentrations of 5, 10 and 25mg ml-1. To evaluate theacaricidal activity, engorged females were submitted to the adultimmersion test. Parameters analyzed were the weight of females;weight of egg mass; percentage of hatch; reproductive efficiency;expected rate of reproduction; and efficacy. For each extract andconcentrating fraction, tests were performed in triplicate. Amongall fractions, the hexane (2.5%) achieved the best results in allparameters analyzed: 52.7% of inhibition of oviposition; 39% ofhatching rate; 3,271 index of reproductive efficiency; and 67.0%effectiveness. The extract obtained gradual dose response withincreasing concentration; and could be used as an aid in thecontrol of R. (B.) microplus therapy.