Table 1.

Survival rates (%) of susceptible reference strain and field isolates determined by acaricide bioassay.

	Organophosphates			Pyrethroids
Tick Sample	Chlorpyrifos	Coumaphos	Diazinon	Cypermethrin	Deltamethrin	Flumethrin
Su	0	0	0	0	0	0
Isolate  32	0	0	14.47	73.52	68.12	72.09
Isolate  38	0	0	8.58	54.5	50	47.73
Isolate  39	0	0	0	84.73	82.99	85.63
Isolate  42	0	0	0	14.56	12.35	12.98
Isolate  45	0	0	32.56	53.02	61.83	61.82