Caracterização da resistência para acaricidas no carrapato Boophilus microplus*

Abstract

The tick Boophilus microplus is a hematophagous ectoparasite of bovine, present in tropical and subtropical areas in the world. It is responsible for great economic losses for the host expoliation, moreover it transmittes Anaplasma sp. and Babesia spp. The most important method for the control of the cattle tick used actually is the chemical control, that it is efficient but dispendious, causes damage to enviroment and contaminates the food. In addition, the number of relates increases and shows the increase in tick resistant populations to several chemical principles present in the acaricides. The molecular basis of resistance in Boophilus microplus are not known, but several studies shows the most mechanisms. Different group of enzymes in different metabolic pathways form the cellular resistance mechanisms and detoxification, moreover several mutations can increase the tolerance to a chemical coumpound. In this moment, other types of control, such as biological and immunological controls has been developed for decrease the resistance in tick populations. But the biological control yet is not viable for large cattle breedings and the protection induced by vaccination is not sufficient to control of B. microplus. The study of resistance mechanisms in the tick could be fundamental importance for its control.