Abstract
ABSTRACTTicks and tick-borne diseases are a major constraint for the sustainable cattle industry in tropical and subtropical regions of the world. Application of chemical acaricides is the most used tick control strategy but has led to development of resistant tick populations. The aim of the present study was to determine the amitraz resistance status of Hyalomma anatolicum ticks from various districts of Punjab, India by modified larval packet test (LPT) using nylon membranes as substrate and formulated amitraz (Taktic® 12.5% EC, MSD Animal Health, India). The regression graphs of probit mortality of larval ticks plotted against log values of increasing concentrations of amitraz were utilized for the determination of slope of mortality, lethal concentration for 50% (LC50), 90% (LC90) and 99% (LC99) with 95% confidence interval (CI), and resistance ratios (RR50, RR90 and RR99). The mean values of RR50, RR90, and RR99 ranged from 0.83 to 1.52, 0.97 to 2.66, and 1.10 to 4.19, respectively, indicating variable resistance status among the field isolates. On the basis of RR90 and RR99 values, four field isolates (Faridkot, Ludhiana, Patiala and Sangrur) showed low levels of resistance, whereas the Ferozpur isolate was susceptible to amitraz. The data generated on amitraz resistance status in H. anatolicum from Punjab, India can be used as an indicator for the management of the species in the state.
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