Prevalence of Resistant Strains of Rhipicephalus Microplus to
Acaricides in Cattle Ranch in the Tropical Region of Tecpan of
Galeana,
Guerrero,
Mexico
J. Olivares-Pérez*, S. Rojas-Hernández, M.T. Valencia-Almazan, I.
Gutiérrez-Segura and E.J. Míreles-Martínez
Faculty of Veterinary Medicine, University Autonomous of Guerrero,
km. 3.0 carr.
Nal. Altam.-Iguala. Cd.
Altamirano, Gro., Mexico CP 40660. Tel/fax: 767 67 23494.
*Corresponding author:
olivaares@hotmail.com
Abstract
Tick and tick borne diseases cause many problems to
the cattle industry worldwide. The prevalence of resistant strains of
Rhipicephalus microplus to different acaricides on cattle farms in the
tropical region of Tecpan of Galeana, Guerrero, Mexico, and risk factors related to prevalence of resistant strains of R.
microplus. Sixty one ranches infested were sampled; in each ranch were
collected 30-50 fully-engorged female R. microplus ticks, of 10 cattle
randomly selected, and evaluated in their progeny resistance to acaricides,
using the larval packet test. The prevalence of resistant strains was total
pyrethroids and amitraz. In organophosphorus 31.1, 48.3 and 82.2% of strains
were resistant to clorpyriphos, coumaphos and diazinon, respectively. Risk
factors favored (P<0.05) the development of resistant strains of acaricides. We
concluded that the resistance of R. microplus to acaricides used to
control a problem, and risk factors (livestock management) have accelerated the
development of resistance.