| SCORE |
SYMPTOMS |
DESCRIPTION |
| 1 |
 |
Clean. No visible symptoms |
| 2 |
 |
Fine or no chlorotic specks, but vigorous plants |
| 3 |
 |
Mild chlorotic streaks on emerging leaves |
| 4 |
 |
Moderate chlorotic streaks on emerging new leaves |
| 5 |
 |
Chlorotic streaks and mottling throughout plant |
| 6 |
 |
Intense chlorotic mottling throughout plant, necrosis of leaf margin |
| 7 |
 |
Excessive chlorotic mottling, mosaic and leaf necrosis. At times dead heart symptoms. |
| 8 |
 |
Excessive chlorotic mottling, leaf necrosis, dead heart and premature death of plants. |
| 9 |
 |
Complete plant necrosis, and dead plant. |
