Table 2.

Baseline toxicity of acaricides in three T. urticae populations selected from a susceptible population.

Population	Field rate (mg a.i./L)	N	LC50 (mg a.i./L)	95% CI	Slope±SEM	Bioassay method	χ2	df	LC50 of Susceptiblea) (mg a.i./L)	RRb)
AbamectinR	23	389	354	226-1254	1.93±0.27	Leaf disc	2.39	2	0.23	1539
BifenazateR	899	526	155	83-280	1.22±0.10	Leaf disc	14.80	5	0.82	189
BifenthrinR	120	180	4539	3263-6150	2.08±0.31	Sticky tape	1.03	2	17.97	253

a)The baseline toxicity of the susceptible population was reported in Piraneo et al. 2015 ⁶

b)RR- resistance ratio