Acaricide resistance and synergism between permethrin and amitraz against susceptible and resistant strains of Boophilus microplus (Acari: lxodidae).

The article presents a study on acaricide resistance and synergism between amitraz and permethrin against susceptible and resistant strains of Boophilus microplus (Acari: Ixodidae). It is posed that the control of the southern cattle tick, Boophilus microplus (Canestrini) in Mexico and some other countries depends on chemical acaricides. Relative to this, it is forwarded that Boophilus microplus has developed resistance to all major types of acaricides in recent years. In this study, the authors employed larval bioassay techniques to identify levels of resistance to amitraz and permethrin and then assessed synergism between these two acaricides in one susceptible laboratory tick strain and four resistant strains from Brazil and Mexico.