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First report of amitraz and cypermethrin resistance in R hipicephalus sanguineus sensu lato infesting dogs in M exico
Author(s) -
RODRIGUEZVIVAS R. I.,
OJEDACHI M. M.,
TRINIDADMARTINEZ I.,
BOLIOGONZÁLEZ M. E.
Publication year - 2017
Publication title -
medical and veterinary entomology
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 1.028
H-Index - 82
eISSN - 1365-2915
pISSN - 0269-283X
DOI - 10.1111/mve.12207
Subject(s) - amitraz , rhipicephalus sanguineus , biology , tick , veterinary medicine , acaricide , cypermethrin , sensu , ixodidae , population , toxicology , zoology , ecology , pesticide , genus , medicine , demography , sociology
Engorged female R hipicephalus sanguineus sensu lato ( I xodida: I xodidae) were collected from dogs in the state of Y ucatán, M exico. Fourteen tick populations were collected from dogs at seven veterinary clinics, four residential homes and three cattle farms. The larval immersion test was used in the progeny of collected adult females to test susceptibility to amitraz and cypermethrin. Dose–mortality regressions, 50% lethal concentrations ( LC 50 ), confidence intervals and slope were estimated by probit analysis. For amitraz, 12 tick populations (85.7%) were classified as resistant and low inter‐population variation in the phenotypic level of resistance was evident [resistance ratios ( RRs ) at LC 50 : 1.0–13.0]. For cypermethrin, 12 tick populations (85.7%) were classified as resistant and substantial inter‐population variation in the phenotypic level of resistance was evident ( RRs at LC 50 : 1.0–104.0). Thus, amitraz resistance in R . sanguineus s.l. is common, but generally occurs at low levels; however, alarmingly high levels of cypermethrin resistance are present in R . sanguineus s.l. populations in dogs in Y ucatán, M exico. The intensive use of both acaricides to control ectoparasites on dogs is likely to lead to more serious resistance problems that may cause high levels of control failure in the future.