Abstract
The infectivity of the entomopathogenic fungus Metarhizium anisopliae (Metschnikoff) was tested against one organophosphate (OP)-resistant and one susceptible Boophilus microplus (Canestrini) strains, by an in vitro assay with engorged B. microplus adult females recently detached from cattle, using the ECS1 strain of M. anisopliae. M. anisopliae micromycete showed to be highly infective against both the susceptible and the OP-resistant strains at the concentration of 108 spores/ml, resulting in 100% mortality for both B. microplus strains at 20 d postinfection. Tick mortality varied considerably depending on spore concentration, with LC50 values of 103 and 102 spores/ml for the susceptible and the OP-resistant strains respectively. B.microplus reproductive parameters decreased after infection but variability existed between the two ticks at different spore concentrations. M. anisopliae can be considered as a potential acaricide for the biological control of both OP-resistant and susceptible strains of the B. microplus tick.
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