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The pathogenicity of four native strains of  Bacillus thuringiensis  against  Rhipicephalus  ( Boophilus )  microplus  (Canestrine) (Acari: Ixodidae) was evaluated. A  R. microplus  strain that is resistant to organophosphates, pyrethroids, and amidines, was used in this study. Adult  R. microplus  females were bioassayed using the immersion test of Drummond against 60  B. thuringiensis  strains. Four strains, GP123, GP138, GP130, and GP140, were found to be toxic. For the immersion test, the total protein concentration for each bacterial strain was 1.25 mg/ml. Mortality, oviposition, and egg hatch were recorded. All of the bacterial strains had significant effects compared to the controls, but no significant differences were seen between the 4 strains. It is evident that these  B. thuringiensis  strains have a considerable detrimental effect on the  R. microplus  strain that is resistant to pesticides.

Evaluation ofBacillus thuringiensisPathogenicity for a Strain of the Tick,Rhipicephalus microplus, Resistant to Chemical Pesticides