Table 2.
Synergistic effects of enzyme inhibitors on cyhalofop-butyl toxicity in different Leptochloa chinensis populations.
| Population | Treatment | Slope (SE) a | ED50 (95% CI) b (g a.i. ha-1) | RR c | SR d |
|---|---|---|---|---|---|
| LC-S | Cyhalofop-butyl | 3.55 (0.81) | 9.3 (5.1–16.9) | 1.0 | – |
| Cyhalofop-butyl + PBO | 1.81 (0.35) | 13.6 (8.4–22.1) | – | 0.7 | |
| Cyhalofop-butyl + Cyanuric chloride | 1.63 (0.12) | 11.5 (9.7–13.7) | – | 0.8 | |
| LC-1701 | Cyhalofop-butyl | 1.80 (0.30) | 187.7 (109.7–321.0) | 20.2 | – |
| Cyhalofop-butyl + PBO | 1.04 (0.13) | 80.9 (46.0–142.3) | – | 2.3 | |
| Cyhalofop-butyl + Cyanuric chloride | 1.17 (0.09) | 89.7 (64.3–125.2) | – | 2.1 | |
| LC-1704 | Cyhalofop-butyl | 1.65 (0.14) | 735.7 (628.5–861.3) | 79.1 | – |
| Cyhalofop-butyl + PBO | 1.22 (0.12) | 497.0 (407.9–605.5) | – | 1.5 | |
| Cyhalofop-butyl + Cyanuric chloride | 1.22 (0.11) | 736.8 (625.5–867.9) | – | 1.0 |
a
standard error.
b
95% confidence interval.
c
RR (resistance ratio) = cyhalofop-butyl ED50 for resistant populations/cyhalofop-butyl ED50 for LC-S population.
d
SR (synergism ratio) = cyhalofop-butyl ED50/ED50 of cyhalofop-butyl plus corresponding synergist.