Table 2. LC₅₀ of novaluron and synergism by PBO.

Strains	Chemicals	LC50 (ppm)	95% CLa)	Synergism ratiob)	Resistance ratioc)
H-1	novaluron	0.64	0.099–3.3
	novaluron+PBO	0.25	0.024–1.8	2.6
BO-1	novaluron	130	23–800		210
	novaluron+PBO	110	14–920	1.2
BO-2	novaluron	49	5.3–460		77
	novaluron+PBO	5.5	0.45–48	8.9
TO-1	novaluron	2.1	0.19–15		3.2
	novaluron+PBO	6.9	0.66–63	0.30
YH-1	novaluron	71	7.5–690		110
	novaluron+PBO	31	3.7–260	2.3

^a) 95% confidence limit^b) Synergism ratio was calculated as (LC₅₀ of novaluron)/(LC₅₀ of novaluron+PBO)^c) Resistance ratio was calculated as (LC₅₀ of tested strain)/(LC₅₀ of H-1)