Table 1.
Toxicity of B. sphaericus strain 2362 against larvaea
| Sample | No. of larvae | LC50 |
LC90 |
||
|---|---|---|---|---|---|
| Mean (95% fiducial limits) | RR | Mean (95% fiducial limits) | RR | ||
| CqSF | 360 | 0.004 (0.003–0.005) | 1.0 | 0.029 (0.019–0.049) | 1.0 |
| IPO | 1,480 | 0.013 (0.010–0.017) | 3.3 | 0.029 (0.022–0.044) | 1.0 |
| JAB | 1,480 | 0.017 (0.013–0.020) | 4.3 | 0.026 (0.023–0.049) | 0.9 |
| AGU | 1,140 | 0.024 (0.021–0.028) | 6.0 | 0.050 (0.042–0.059) | 1.7 |
a
Larvae were fourth-instar Culex quinquefasciatus from a susceptible laboratory colony (CqSF), two nontreated populations (IPO, JAB), and one treated population exposed to B. sphaericus (AGU). Shown are lethal concentrations (mg/liter) for 50% (LC50) or 90% (LC90) of larvae after 48 h. RR, resistance ratio; LC for the population tested/LC for the CqSF reference colony.