Table 1.
LC50, EC50, and NOEC values for the multigenerational toxicity of imidacloprid and thiacloprid to the springtail Folsomia candida in LUFA 2.2 soil
| Compound | Generation | LC50 (mg/kg dry soil) | EC50 (mg/kg dry soil) | EC10 (mg/kg dry soil) | NOEC (mg/kg dry soil) |
|---|---|---|---|---|---|
| Imidacloprid | F0 | 0.44 | 0.29 | 0.24 | 0.10 |
| (0.27–0.72) | (−) | (−) | |||
| F1 | 0.39 | 0.12 | 0.080 | 0.10 | |
| (0.31–0.50) | (−) | (−) | |||
| F2 | 0.21 | 0.14 | 0.098 | 0.10 | |
| (0.14–0.30) | (−) | (−) | |||
| Thiacloprid | F0 | 9.0 | 1.5 | 0.23 | 0.11 |
| (5.6–14) | (0.70–2.3) | (−) | |||
| F1 | >3.3 | >3.3 | >3.3 | >3.3 | |
| F2 | >3.3 | >3.3 | >3.3 | 3.3 | |
| Boric acid | 127 (115–141) | 51 (47–54) | 29 (25–33) | 20 |
Animals were exposed for three consecutive generations to soil spiked with these compounds at the start of the experiment. Also shown are 95% confidence intervals for the LC50 and EC50 values where calculable. All values are based on nominal concentrations at the start of the exposures. Also included are data on the toxicity of boric acid, which was tested as a reference compound