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This study was conducted to evaluate resistance status of Rhipicephalus e. evertsi,
Hyalomma anatolicum, collected from cattle, and Hyalomma dromedarii, collected from
camels, to cypermethrin using larval packet test. The ticks of the study were collected
from Alelafon area, where cypermethrin was intensively used for tick control. The
resistance factors (RF) of these tick species were 18.92, 8.65 and 7.6 folds, respectively,
which indicate that the three tick species are resistant to cypermethrin. The results also
show that Rhipicephalus e. evertsi is the most resistant tick species to cypermethrin
followed by Hyalomma anatolicum and then Hyalomma dromedarii. The relatively low
Chi Square (χ2) value of Rhipicephalus e. evertsi (12.29) due to cypermethrin indicates
that the population of this tick species is homogeneously resistant to the acaricide, while
the high χ2 values of Hyalomma anatolicum and Hyalomma dromedarii (53 and 22.84,
respectively) are due to the heterogeneous resistance of these tick species populations to
the cypermethrin.
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