Table 1. Relative toxicity of spinosad to successive generations of spinosad–selected and –unselected strains of the tomato borer Tuta absoluta.
| Population | Generation | Degrees of freedom | Slope ± SE | LC50 (95% CI) (µg a.i./mL) | LC99 (95% CI) (µg a.i./mL) | RR50 (95% CI) | ?2 |
| Unselected | F1 | 5 | 1.85±0.23 | 0.41 (0.30–0.52) | 7.37 (4.36–17.04) | – | 1.51 |
| Spinosad-selected | F2 | 6 | 1.21±0.18 | 1.41 (0.882–2.14) | 117.77 (42.813–703.52) | 3.43 (3.25–3.61) | 1.51 |
| F3 | 6 | 1.06±0.20 | 13.13 (4.08–43.74) | 2048.90 (270.67–0.28×107) | 32.01 (32.44–32.58) | 9.91 | |
| F4 | 5 | 1.14±0.26 | 294.15 (147.85–520.62) | 3166.00 (7419.20–0.13×107) | 717.14 (716.26–718.01) | 2.66 | |
| F5 | 5 | 1.98±0.31 | 1333.67 (718.99–2109.73) | 19760.00 (9020.30–0.11×106) | 3256.03 (3255.62–3258.03) | 5.24 | |
| F7 | 6 | 1.16±0.18 | 2200.41 (1051.24–3944.73) | 22.09×107 (6.0×107–3.9×109) | 5380.88 (5379.52–5382.24) | 6.74 | |
| F12 | 5 | 1.70±0.36 | 3706.34 (2055.99–6152.69) | 86640.00 (32808.00–0.82×106) | 9030.57 (9028.39–9032.74) | 1.98 | |
| F13 | 4 | 1.45±0.27 | 1180.48 (698.73–1756.64) | 47952.00 (18525.00–0.35×106) | 2880.06 (2878.68–2881.44) | 0.79 | |
| F14 | 4 | 1.62±0.20 | 1637.63 (1240.59–2117.19) | 44902.00 (23312.00–0.13×106) | 3993.27 (3993.08–3993.37) | 3.16 | |
| F16 | 4 | 1.47±0.19 | 1717.33 (998.16–2764.20) | 65180.00 (21576.00–0.90×106) | 4191.55 (4192.49–4192.61) | 5.46 | |
| F18 | 5 | 1.08±0.19 | 956.66 (542.62–1537.35) | 0.13×106 (38335.00–0.10×107) | 2338.54 (2338.42–2338.65) | 1.78 | |
| F21 | 4 | 1.86±0.23 | 1034.05 (664.63–1462.17) | 18271.00 (8876.20–76320.00) | 2526.35 (2526.20–2526.49) | 4.35 | |
| F22 | 4 | 2.04±0.23 | 1290.22 (1017.12–1601.71) | 17848.00 (11037.00–37045.00) | 3150.06 (3149.90–3150.21) | 1.56 |
All of the concentration-mortality curves followed the probit model based on the χ2 goodness-of-fit test (P>0.05).