title: Evaluation of Rhipicephalus (Boophilus) microplus (Acari: Ixodidae) resistance to different acaricide formulations using samples from Brazilian properties.
abstract: The Rhipicephalus (Boophilus) microplus tick is responsible for considerable economic losses in Brazil, causing leather damage, weight loss and reduced milk production in cattle and results in the transmission of pathogens. Currently, the main method for controlling this tick is using acaricides, but their indiscriminate use is one of the major causes of resistance dissemination. In this study, the adult immersion test (AIT) was used to evaluate resistance in ticks from 28 properties located in five different states (Mato Grosso do Sul, Mato Grosso, Ceará, São Paulo, e Minas Gerais) and the Distrito Federal (DF) of Brazil. The resistance was found in 47.64% of the repetitions demonstrating an efficacy of less than 90% in various locations throughout the country. The larvae packet test was used to evaluate samples from ten properties in four states (Mato Grosso do Sul, Mato Grosso, Minas Gerais and Espírito Santo). Spray products belonging to the main classes of acaricides, including combination formulations, were used in both types of test. New cases of resistance were found on properties within the states of Ceará, Espírito Santo and Mato Grosso, where such resistance was not previously reported.
authors.affiliation: Programa de Pós-graduação em Ciência Animal, Universidade Federal de Mato Grosso do Sul, Universidade Federal de Mato Grosso do Sul, Campo Grande MS , Brasil, Programa de Pós-graduação em Ciência Animal, Universidade Federal de Mato Grosso do Sul - UFMS, Campo Grande, MS, Brasil.
authors.forename: Leandro de Oliveira Souza
authors.initials: Lde O
authors.lastname: Higa
authors.affiliation: Laboratório de Sanidade Animal, Empresa Brasileira de Pesquisa Agropecuária, Empresa Brasileira de Pesquisa Agropecuária, Campo Grande MS , Brasil, Laboratório de Sanidade Animal, Empresa Brasileira de Pesquisa Agropecuária - Embrapa Gado de Corte, Campo Grande, MS, Brasil.
authors.forename: Marcos Valério
authors.initials: MV
authors.lastname: Garcia
authors.affiliation: Laboratório de Sanidade Animal, Empresa Brasileira de Pesquisa Agropecuária, Empresa Brasileira de Pesquisa Agropecuária, Campo Grande MS , Brasil, Laboratório de Sanidade Animal, Empresa Brasileira de Pesquisa Agropecuária - Embrapa Gado de Corte, Campo Grande, MS, Brasil.
authors.forename: Jacqueline Cavalcante
authors.initials: JC
authors.lastname: Barros
authors.affiliation: Laboratório de Sanidade Animal, Empresa Brasileira de Pesquisa Agropecuária, Empresa Brasileira de Pesquisa Agropecuária, Campo Grande MS , Brasil, Laboratório de Sanidade Animal, Empresa Brasileira de Pesquisa Agropecuária - Embrapa Gado de Corte, Campo Grande, MS, Brasil.
authors.forename: Wilson Werner
authors.initials: WW
authors.lastname: Koller
authors.affiliation: Laboratório de Sanidade Animal, Empresa Brasileira de Pesquisa Agropecuária, Empresa Brasileira de Pesquisa Agropecuária, Campo Grande MS , Brasil, Laboratório de Sanidade Animal, Empresa Brasileira de Pesquisa Agropecuária - Embrapa Gado de Corte, Campo Grande, MS, Brasil.
authors.forename: Renato
authors.initials: R
authors.lastname: Andreotti
mesh_terms: D056810:Acaricides / Q000737:chemistry / Q000494:pharmacology*; D000818:Animals; D001938:Brazil; D002417:Cattle; D002418:Cattle Diseases / Q000469:parasitology; D004351:Drug Resistance; D048494:Rhipicephalus / Q000145:classification / Q000187:drug effects*
chemical_list: D056810:Acaricides