Teste de sensibilidade ao Amitraz e Deltametrina em Rhipicephalus sanguineus Sensu Latona região metropolitana de Manaus

Abstract

The tick Rhipcephalus sanguineus is an acari that has great impact on veterinary medicine, because it acts as a vector of many diseases in animals and even in humans, in which case it has been parasitized by this acari. Some active principle has been used in an effort of control this parasite, however its continuous use can end up causing resistence in this acari, resuting in hard control. Some authors already reported resistance of this and others ticks in some places in Brazil. Although, little it is known about the resistance of R. sanguineus to the active principle commonly used. The objective of this research was to test the resistance of R. sanguineus to two active principles most used as tick control: Amitraz and Deltamethrin. Thus, a population of 90 females parthenogynous was used after being taken from 46 parasitized dogs collected from donor collections from all areas of Manaus -AM. The parthenogynous where than divided in 3 groups. Group 1 was exposed to amitraz, group 2 was exposed to Deltamethrin and group 3 was exposed to distilled water. By the end of 15 days of experiment twenty-five individuals of group 1 died (83,3%) and five survived (16,7%), although they didn’t lay eggs; 100% of the individuals of group 2 died; all individuals of group 3 survived and they laid eggs. This experiment showed that the active principles tested were effective in the control of this parasite, since even in group, individuals who have survived the test failed to lay eggs, making it impossible to finish the biological cycle.