Abstract

ARAQUE, Alejandra et al. ACARICIDAL RESISTANCE OF Rhipicephalus (Boophilus)microplus IN SOME COLOMBIAN CATTLE FARMS. rev.udcaactual.divulg.cient. [online]. 2014, vol.17, n.1, pp.161-170. ISSN 0123-4226.

Problems related to parasitosis, such as ectoparasites, including ticks, are broad and important in veterinary practice due to increasing resistance of the indiscriminate use of acaricides. The present study corresponded to a survey on cattle tick (Rhipicephalus (Boophilus) microplus) susceptibility to two acaricides conducted in 71 ranches located in different Colombian regions, with different production systems and variable cattle population. Field samples of the cattle tick were collected and tested by the Adult Immersion Test recommended by FAO. Also, a semistructured interview was conducted, for collecting information to characterize some aspects of acaricide management in cattle ranches. The computer program Microsoft Office Excel (2010) was used to tabulate and analyze data, and R-UCA was used to recode variables and generate graphs of tick mortality and efficacy of the acaricides amitraz and ethion. It is highlighted that 97% and 52% of the ranches showed resistance to amitraz and ethion, respectively, evidencing a loss of efficacy by antiparasitic molecules to control cattle ticks.

Keywords : Ectoparasites; adult immersion test (AIT); amitraz; ethion; antiparasitic drugs.

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