Table 2.
Comparison of bed bug first instar LC50 values when exposed to 5 different concentrations of imidacloprid/β-cyfluthrin and acetamiprid/bifenthrin for a pyrethroid-susceptible strain (Harlan) and two pyrethroid-resistant strains (Richmond and Epic Center).
| Strain | n | LC50 (95% CI) | Slope ± SE | X2 (df) | RR |
|---|---|---|---|---|---|
| Imidacloprid/β-cyfluthrin | |||||
| Harlan | 150 | 0.04 µL/mL (0.03–0.06) b | 2.16 ± 0.34 | 38.17 (28) | |
| Richmond | 195 | 4.81 µL/mL (1.94–10.26) a | 0.66 ± 0.12 | 45.87 (37) | 121 |
| Epic Center | 190 | 19.72 µL/mL (8.18–184.48) a | 0.75 ± 0.17 | 45.39 (36) | 493 |
| Acetamiprid/bifenthrin | |||||
| Harlan | 155 | 0.007 ng/mL (0.005–0.008) c | 3.29 ± 0.48 | 33.95 (29) | |
| Richmond | 125 | 0.69 ng/mL (0.21–1.43) b | 0.94 ± 0.19 | 29.91 (23) | 99 |
| Epic Center | 115 | 13.6 ng/mL (3.9–1215.8) a | 0.50 ± 0.13 | 23.31 (21) | 1943 |
LC50 values followed by different letters are significantly different determined by the failure of the confidence intervals to overlap (PoloPlus 2004).