| Generation | No. Plants | Expected ratio | χ2 | P | |
| Resistant | Susceptible | ||||
| P1 | 40 | 0 | - | - | - |
| P2 | 0 | 30 | - | - | - |
| BC2F1 | 40 | 23 | 3:1 | 4.45 | 0.035 |