Table 1.
Probit analysis of the international strains and the Australian strongly resistant strain with their F1 progenies exposed to phosphine for 48 h
| Strain or cross | n (number) | Slope ± SE | LC50 (mg L−1) (95% FL) | LC99.9 (mg L−1) | df | Modified χ2 | P | Rf (95%CI) at LC50 |
|---|---|---|---|---|---|---|---|---|
| Cross of SRVN1 × SRAus | ||||||||
| SRVN1 | 2827 | 2.69±0.22 | 0.286 (0.254–0.318) | 4.024 | 5 | 3.746 | 0.587 | — |
| F1A | 1589 | 3.06±0.38 | 0.272 (0.223–0.314) | 2.781 | 4 | 3.342 | 0.502 | 0.95 (0.80–1.14) |
| F1B | 1664 | 3.02±0.36 | 0.297 (0.248–0.340) | 3.123 | 4 | 3.629 | 0.459 | 1.04 (0.87–1.23) |
| F1 pooled | 3253 | 3.03±0.26 | 0.284 (0.254–0.312) | 2.972 | 4 | 7.032 | 0.134 | 0.99 (0.86–1.15) |
| SRAus | 3007 | 4.08±0.30 | 0.292 (0.268–0.317) | 1.672 | 5 | 3.036 | 0.694 | 1.02 (0.90–1.17) |
| Cross of SRVN2 × SRAus | ||||||||
| SRVN2 | 2706 | 3.49±0.22 | 0.198 (0.182–0.215) | 1.522 | 5 | 9.400 | 0.094 | — |
| F1A | 1794 | 3.04±0.29 | 0.217 (0.188–0.243) | 2.256 | 4 | 6.598 | 0.159 | 1.09 (0.95–1.25) |
| F1B | 1802 | 2.98±0.34 | 0.215 (0.179–0.247) | 2.339 | 4 | 5.189 | 0.268 | 1.08 (0.92–1.27) |
| F1 pooled | 3596 | 3.01±0.21 | 0.216 (0.196–0.234) | 2.297 | 4 | 9.167 | 0.057 | 1.09 (0.97–1.22) |
| SRAus | 3007 | 4.08±0.30 | 0.292 (0.268–0.317) | 1.672 | 5 | 3.036 | 0.694 | 1.47 (1.32–1.65) |
| Cross of SRCN × SRAus | ||||||||
| SRAus | 3007 | 4.08±0.30 | 0.292 (0.268–0.317) | 1.672 | 5 | 3.036 | 0.694 | — |
| F1A | 2407 | 3.97±0.39 | 0.299 (0.260–0.338) | 1.795 | 6 | 9.565 | 0.144 | 1.02 (0.89–1.18) |
| F1B | 2412 | 4.10±0.32 | 0.333 (0.299–0.368) | 1.89 | 6 | 7.632 | 0.266 | 1.14 (1.00–1.29) |
| F1 pooled | 4819 | 4.02±0.25 | 0.316 (0.291–0.341) | 1.853 | 6 | 16.273 | 0.012* | 1.08 (0.97–1.21) |
| SRCN | 3851 | 3.67±0.26 | 0.361 (0.327–0.395) | 2.506 | 7 | 10.562 | 0.159 | 1.23 (1.10–1.39) |
F1A is progenies of cross SRVN/SRCN (♀) × SRAus (♂); F1B is progenies of cross SRAus (♀) × SRVN /SRCN (♂). df, degree of freedom; n, number insects tested; SE, standard error, 95% FL, 95% fiducial limits; LC50, lethal concentration at 50% mortality; LC99.9, lethal concentration at 99.9% mortality; Rf, resistance factor; 95% CI, 95% confident interval.
*P < 0.05.