title: Characterization of permethrin-resistant Boophilus microplus (Acari: Ixodidae) collected from the state of Coahuila, Mexico.
abstract: Southern cattle ticks, Boophilus microplus (Canestrini) (Acari: Ixodidae), collected in Coahuila, Mexico, were determined to be resistant to permethrin. Discriminating concentration (DC) tests at the LC99 and 2X the LC99 of susceptible ticks produced 0 and 0.5% mortality, respectively, for permethrin. However, measured mortalities for coumaphos and amitraz acaricides were within the expected ranges. Polymerase chain reaction analysis of this strain detected a 99% frequency of homozygous resistant individuals in this strain.
authors.affiliation: USDA-ARS, Cattle Fever Tick Research Laboratory, Moore Air Base, Bldg. 6419, 22675 North Moorefield Road, Edinburg, TX 78541, USA. robert.miller@ars.usda.gov
authors.forename: Robert J
authors.initials: RJ
authors.lastname: Miller
authors.forename: Jesus A Esparza
authors.initials: JA
authors.lastname: Rentaria
authors.forename: Humberto Quiroz
authors.initials: HQ
authors.lastname: Martinez
authors.forename: John E
authors.initials: JE
authors.lastname: George
mesh_terms: D000818:Animals; D001096:Arachnid Vectors / Q000187:drug effects* / Q000235:genetics; D002417:Cattle; D003372:Coumaphos; D005260:Female; D006720:Homozygote; D007305:Insecticide Resistance / Q000235:genetics*; D007306:Insecticides; D026863:Ixodidae / Q000235:genetics; D008800:Mexico; D026023:Permethrin; D015222:Sodium Channels / Q000235:genetics; D014052:Toluidines
chemical_list: D007306:Insecticides; D015222:Sodium Channels; D014052:Toluidines; C014983:amitraz; D026023:Permethrin; D003372:Coumaphos