Division V.2 Visual assessment of discoloration
United Kingdom
The classification of trees into degrees of discoloration shall be carried out.
The degrees of discoloration shall be defined as follows:
| Class | Discoloration | Indicative percentage of needles/leaves discolored |
|---|---|---|
| 0 | None or negligible | 0 - 10 |
| 1 | Slight | 11 - 25 |
| 2 | Moderate | 26 - 60 |
| 3 | Severe | > 60 |
If, in addition, defoliation and discoloration classes are combined, the following combined damage classes shall be used:
| 0 = not damaged, I = slightly damaged, II = moderately damaged, III = severely damaged, IV = dead | |||
| Defoliation class | Discoloration class | ||
|---|---|---|---|
| 1 | 2 | 3 | |
| Resulting damage class | |||
| 0 | 0 | I | II |
| 1 | I | II | II |
| 2 | II | III | III |
| 3 | III | III | III |
| 4 | IV | IV | IV |