Pyrethroid Acaricide Resistance Is Proportional to P-450 Cytochrome Oxidase Expression in the Cattle Tick Rhipicephalus microplus

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