Acute toxicities of deltamethrin and β-cyfluthrin to Richmond and Harlan strain bed bugsa.

aInsecticide toxicities are presented as LD50 and their 95% confidence intervals (95% CI) in nanograms (ng) per insect, the dose at which 50% of the test populations were killed in a 24-h bioassay.bResistance ratios (RR) were calculated by RR = LD50Richmond/LD50 Harlan. The asterisk next to the ratios indicates a significant difference between the LD50 values for the Richmond and Harlan strains based on the non-overlapping 95% CI of the LD50 values.a. 杀虫剂的毒性以半数致死剂量（LD50）及其95%置信区间（95% CI）表示，单位为每头试虫纳克（ng），该剂量指在24小时生物测定中可杀死50%供试种群的药剂用量。b. 抗性比率（RR）通过公式RR = LD50Richmond/LD50Harlan计算得出。比率旁的星号表示：基于Richmond品系与Harlan品系LD50值的95%置信区间无重叠，二者的LD50值存在显著差异。