Table 2 Resistance to deltamethrin of larvae of three laboratory strains [susceptible strain (SS), deltamethrin-resistant strain 1 (HN) and deltamethrin-resistant strain 2 (RR)] and four field-collected strains [from Beihai, Guangxi (BH); Liuzhou, Guangxi (LZ); and Sanya, Hainan (SY1 and SY2)] of Culex quinquefasciatus determined by bioassay
Strain | Slope ± SE | LC50 (μg/ml) | 95% CI | χ2 (df) | Ρ | Resistance ratio |
|---|---|---|---|---|---|---|
SS | 2.452 ± 0.248 | 0.0000029 | 0.00000192–0.00000687 | 9.265(3) | 0.026 | 1 |
HN | 0.827 ± 0.177 | 0.014 | 0.002–0.032 | 2.521(3) | 0.472 | 4828 |
RR | 0.900 ± 0.116 | 0.572 | 0.381–0.782 | 5.224(4) | 0.265 | 197,241 |
LZ | 1.796 ± 0.211 | 0.159 | 0.125–0.195 | 0.234(3) | 0.972 | 54,828 |
BH | 2.525 ± 0.274 | 0.130 | 0.108–0.153 | 2.681(3) | 0.444 | 44,828 |
SY2 | 2.322 ± 0.263 | 0.083 | 0.066–0.099 | 0.714(3) | 0.870 | 28,621 |
SY1 | 2.024 ± 0.240 | 0.101 | 0.078–0.124 | 0.263(3) | 0.967 | 34,828 |