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Table 2 Resistance bioassay results of larval Aedes albopictus in urban, suburban and rural settings in Guangzhou, China. Sites in the same column connected by different letters represent a significant difference in resistance levels at P < 0.05

From: Evidence for multiple-insecticide resistance in urban Aedes albopictus populations in southern China

Location Population name Bti Deltamethrin Propoxur Malathion
LC50 (95% CI) (mg/l) RR50 LC50 (95% CI) (mg/l) RR50 LC50 (95% CI) (mg/l) RR50 LC50 (95% CI) (mg/l) RR50
Urban UBT 0.016 (0.009–0.026) 0.4 0.016 (0.010–0.026)bc 16.0* 2.29 (1.58–3.06)ab 2.6* 0.177 (0.159–0.198) 1.3
UYS 0.035 (0.030–0.040) 1.0 0.038 (0.032–0.046)a 38.0* 3.29 (2.47–4.39)a 3.7* 0.260 (0.227–0.301) 1.9
Suburban SBL 0.038 (0.024–0.058) 1.1 0.017 (0.014–0.022)b 17.0* 1.52 (1.09–2.08)c 1.7 0.109 (0.096–0.125) 0.8
SPX 0.016 (0.012–0.021) 0.4 0.011 (0.009–0.013)c 11.0* 2.14 (1.89–2.40)b 2.4* 0.099 (0.088–0.113) 0.7
Rural RDS 0.014 (0.007–0.002) 0.4 0.014 (0.007–0.024)bc 14.0* 1.41 (1.25–1.59)c 1.6 0.145 (0.106–0.204) 1.1
RPL 0.014 (0.009–0.021) 0.4 0.022 (0.020–0.026)b 22.0* 2.87 (2.53–3.19)a 3.3* 0.217 (0.171–0.282) 1.6
Lab strain LSS 0.036 (0.028–0.047) 1 0.001 (0.001–0.001) 1 0.879 (0.802–0.952) 1 0.134 (0.121–0.149) 1
  1. Abbreviations: LC 50 lethal concentration that kills 50% of the population (mg/l), RR 50 resistant ratio, LC 50 field population/LC50 susceptible strain, Bti 7000 ITU/mg
  2. *Significant resistance compared to the laboratory susceptible strain as indicated by at least a 2-fold higher RR50 value relative to the laboratory susceptible strain