First report of fipronil resistance in Rhipicephalus (Boophilus) microplus of Mexico |
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| Authors: | Robert J Miller Consuelo Almazán Martín Ortíz-Estrada Ronald B Davey John E George Adalberto Peréz De León |
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| Institution: | 1. USDA, ARS Cattle Fever Tick Research Laboratory, 22675 N. Moorefield Rd., Edinburg, TX 78541, USA;2. Facultad de Medicina Veterinaria y Zootecnia, University of Tamaulipas, Km 5 carretera Victoria-Mante, Cd Victoria, Tam. CP 87000, Mexico;3. NOVARTIS Salud Animal México, Pedro Moreno 1677 5o Piso Col. Americana, Guadalajara, Jal. CP. 44 600, Mexico;4. USDA, ARS, Knipling-Bushland US Livestock Insects Research Laboratory, 2700 Fredericksburg Rd., Kerrville, TX 78028, USA |
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| Abstract: | Five strains of Rhipicephalus (Boophilus) microplus collected from Tamaulipas Mexico were tested for resistance against several classes of acaricides commonly used. All were resistant to fipronil. Four of five were co-resistant to permethrin and coumaphos in addition to being resistant to fipronil. One strain, El Zamora was found multi-resistant to permethrin, coumaphos, fipronil, and amitraz. Selection with fipronil for 3 generations produced a resistance ratio of 8.3 and 9.4 at the LC50 and the LC99 estimates, respectively. Permethrin resistance in El Zamora was possibly linked to elevated esterase (CZEST9) and could be a contributing factor of resistance to fipronil. The implications of resistance for the control of the southern cattle tick in the future are discussed. |
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