| Nuclear | G 1 | G 2 | G 3 | G 4 | G5 | |
| Factor | ||||||
| Varietal mixture | 0.00 | 0.00 | 0.01 | 0.25 | 0.25 | 0.25 |
| Mosaic | 0.00 | 0.10 | 0.20 | 0.50 | 1.00 | 2.00 |
| Leafroll | 0.00 | 0.05 | 0.10 | 0.25 | 0.25 | 0.25 |
| Total visible virus | 0.00 | 0.10 | 0.30 | 0.75 | 1.25 | 2.25 |
| Phytoplasmas | 0.00 | 0.00 | 0.10 | 0.20 | 0.50 | 1.00 |
| Black leg | 0.00 | 0.10 | 0.50 | 1.00 | 2.00 | * |
| Ring rot | 0.00 | 0.00 | 0.00 | 0.00 | 0.00 | 0.00 |
| Nematode | 0.00 | 0.00 | 0.00 | 0.00 | 0.00 | 0.00 |
| Spindle tuber viroid and other quarantined pests | 0.00 | 0.00 | 0.00 | 0.00 | 0.00 | 0.00 |