Table 4. Susceptibility of Cry1Ac-selected (Cry-SEL) populations of H. armigera to Cry1Ac and other insecticides tested in the presence or absence of a PBO or DEF.
| Population | Treatment | LC50 (95% FL) | Slope ± SE | RR1 | SR2 |
| Lab-PK | Cry1Ac | 0.58 (0.28–1.20) | 1.07±0.16 | – | – |
| Cry1Ac+ PBO | 0.50 (0.39–1.50) | 3.09±0.46 | – | 1 | |
| Cry1Ac+ DEF | 0.48(0.12–1.34) | 1.44±0.23 | – | 1 | |
| Profenofos | 0.50 (0.20–1.03) | 1.06±0.17 | – | – | |
| Profenofos+ PBO | 0.98(0.52–1.60) | 1.58±0.24 | – | 1 | |
| Profenofos+ DEF | 0.44(0.15–0.95) | 1.01±0.17 | – | 1 | |
| Indoxacarb | 0.90 (0.48–1.71) | 1.27±0.17 | – | – | |
| Indoxacarb+ PBO | 1.05 (0.62–3.10) | 3.54±0.49 | – | 1 | |
| Indoxacarb+ DEF | 1.29 (0.81–2.44) | 1.79±0.27 | – | 1 | |
| Deltamethrin | 0.42 (0.17–0.78) | 1.27±0.22 | – | – | |
| Deltamethrin + PBO | 0.14 (0.08–0.43) | 1.56±0.23 | – | ||
| Deltamethrin+ DEF | 0.09 (0.03–0.23) | 1,23±0.13 | – | ||
| Cry1Ac-SEL | Cry1Ac | 315.4(254.8–540.3) | 1.65±0.37 | 544 | – |
| Cry1Ac+ PBO | 1.15(0.56–2.44) | 1.07±0.15 | 2 | 274 | |
| Cry1Ac+ DEF | 4.31(2.80–6.66) | 1.82±0.27 | 9 | 73 | |
| Profenofos | 421(221.8–602.7) | 2.17±0.29 | 842 | – | |
| Profenofos+ PBO | 1.27(0.76–2.06) | 1.79±0.27 | 1 | 331 | |
| Profenofos+ DEF | 4.85(3.44–6.57) | 2.82±0.45 | 11 | 87 | |
| Indoxacarb | 277.9(122.2–436.7) | 2.24±0.41 | 309 | – | |
| Indoxacarb+ PBO | 1.25 (0.70–2.27) | 1.40±0.18 | 1 | 222 | |
| Indoxacarb+ DEF | 4.54 (3.14–6.52) | 2.26±0.31 | 4 | 61 | |
| Deltamethrin | 52.3 (36.7–89.5) | 2.79±0.41 | 125 | – | |
| Deltamethrin + PBO | 5.12 (1.32–15.6) | 1.93±0.23 | 37 | 10 | |
| Deltamethrin+ DEF | 3.25 (1.11–11.3) | 2,12±0.14 | 36 | 16 |
1
Resistance ratio was LC50 of Cry1Ac or insecticides for Cry1Ac-SEL÷LC50 of Cry1Ac or insecticides for Lab-PK.
2
The synergism ratio (SR) was calculated from LC50 of Cry1Ac or other insecticides tested÷LC50 of Cry1Ac+inhibitor or insecticides+inhibitor.