| N˚ | Scores | Description |
| 1 | Zéro: 0 | Normal growth and tillering |
| 2 | One: 1 | Near normal growth and tillering; reddish-brown spots or orange discoloration on older leaf tips |
| 3 | Three: 3 | Three (3) Near normal growth and tillering; reddish-brown, purple, or orange discolouration on older leaves |
| 4 | Five: 5 | Five (5) Delayed growth and tillering; many discoloured leaves |
| 5 | Seven: 7 | Growth and tillering cease; most leaves discoloured or dead |
| 6 | Nine: 9 | Nearly all plant dies or total plant death |