Evaluation of the efficiency of acrycides on Rhipicephalus (Boophilus) microplus in the state of Bahia

Abstract

The Rhipicephalus (Boophilus) microplus tick is responsible for large losses in the national livestock, mainly due to the reduction in the productive performance of cattle, such damages estimated in billions of dollars per year are proved by the direct action of the hematophagia of the parasite that in addition is transmitter of other pathogens. The development of resistance to the main classes of acaricides currently employed has been widely reported, as well as the occurrence of residues in animal products and ecological problems. The present work had the objective of evaluating the efficiency of carrapaticides on R. (B.) microplus collected in properties in several regions of the state of Bahia. In order to do so, we were able to collect engorged telegraphs in several production units in the region. In vitro tests were performed with seven chemical groups of diluted acaricides as recommended by the manufacturers. For the tests, the ticks were divided into homogeneous groups, where it was later quantified the reduction oviposture and hatching. The results obtained in the experiments indicated varying degrees of efficacy of the several bases studied. It is concluded that, for the region studied, there are different degrees of efficiency to the main active principles commercialized, and many of them have less than 95% efficiency, which is determined as acceptable by Brazilian legislation carrapaticides.