title: Amblyomma cajennense (Acari: Ixodidae) tick populations susceptible or resistant to acaricides in the Mexican Tropics.
abstract: The objectives of the present study were: (i) to identify the frequency of cattle farms with a cohabitation of Amblyomma cajennense and Rhipicephalus microplus, (ii) to determine the status of susceptibility or resistance to acaricides used in Veracruz, Mexico, on A. cajennense populations and (iii) to identify factors associated with A. cajennense resistant to acaricides. Fifty farms were visited to determine the presence of ticks (A. cajennense and R. microplus) and to collect engorged A. cajennense individuals. From these, 24 A. cajennense populations were evaluated in resistance bioassays using discriminating doses of acaricides. The acaricides tested were organophosphates (chlorpiriphos, coumaphos and diazinon), pyrethroids (flumethrin, deltamethrin and cypermethrin), amidines (amitraz) and fipronil (a broad spectrum N-phenylpyrazole insecticide). A. cajennense infesting bovines were identified in 86% (43/50) of the farms visited, and 100% of the farms sampled (43/43) had cohabitation between R. microplus and A. cajennense. Of the farm owners or managers surveyed, 87.5% could not distinguish the morphological difference between tick genera. Populations of A. cajennense were 100%, 91.7% and 12.5% resistant to diazinon, coumaphos and chlorpyriphos (organophosphates), respectively, and 12.5% to amitraz, as were those susceptible to flumethrin and fipronil. In conclusions, populations of A. cajennense showed a high frequency of resistance to the organophosphates tested and to amitraz. Factors associated with the resistance to acaricides in A. cajennense were not identified.
authors.affiliation: Centro de Enseñanza, Investigación y Extensión en Ganadería Tropical, Facultad de Medicina Veterinaria y Zootecnia, Universidad Nacional Autónoma de México, Km. 5.5 Carretera Federal Tlapacoyan-Martínez de Torre, CP 93600 Martínez de Torre, Veracruz, Mexico. alonsodm@unam.mx
authors.forename: M A
authors.initials: MA
authors.lastname: Alonso-Díaz
authors.forename: A
authors.initials: A
authors.lastname: Fernández-Salas
authors.forename: F
authors.initials: F
authors.lastname: Martínez-Ibáñez
authors.forename: J
authors.initials: J
authors.lastname: Osorio-Miranda
mesh_terms: D056810:Acaricides / Q000494:pharmacology*; D000822:Animal Husbandry; D000818:Animals; D002417:Cattle; D002418:Cattle Diseases / Q000453:epidemiology / Q000469:parasitology; D003625:Data Collection; D006801:Humans; D007305:Insecticide Resistance; D026863:Ixodidae / Q000187:drug effects*; D008800:Mexico / Q000453:epidemiology; D012307:Risk Factors; D011795:Surveys and Questionnaires; D013984:Tick Infestations / Q000453:epidemiology / Q000469:parasitology / Q000662:veterinary*; D014329:Tropical Climate
chemical_list: D056810:Acaricides
keywords: Acaricides; Amblyomma cajennense; Mexico; Resistance; Risk factors