Comparative resistance status of Hyalomma anatolicum and Rhipicephalus (Boophilus) microplus ticks against Synthetic Pyrethroids (deltamethrin and cypermethrin) from Banaskantha, Gujarat, India

Comparative resistance status against synthetic pyrethroids (deltamethrin and cypermethrin) in two economically important ticks, Hyalomma anatolicum and Rhipicephalus (Boophilus) microplus, of North Gujarat was tested using commercially available deltamethrin (1.25%) and cypermethrin (10%) by Larval Packet Test. Results revealed that low level of resistance has been developed in H. anatolicum tick isolates of Vasda, Shihori, and Palanpur against deltamethrin (level I; RF = 2.39-3.79) and that for cypermethrin Vasda, Vav, Soneth, Palanpur tick isolates were found to be resistant (level I; RF = 1.5-4.6). The R. (B.) microplus isolates from Vav revealed highest resistance level IV (RF = 43.8) and level I resistance (RF = 1.77-3.52) from Mahadevpura, Vasda, Rooppura, Bhadath against deltamethrin. Resistance level for cypermethrin in Ranpur isolate was I (RF = 1.62); however, in Mahadevpura and Vasda tick isolateit was up to level II (RF = 17.26 and 8.16, respectively). R. (B.) microplus tick isolates from Vasda and Mahadevpura were resistant against both deltamethrin and cypermethrin with resistance level I and II, respectively. Similarly, H. anatolicum tick isolates from Vasda were resistant to both deltamethrin and cypermethrin with level I resistance (RF = 3.79 for deltamethrin and 1.8 for cypermethrin).