# Commission Regulation (EC) No 1737/2006 of 7 November 2006 laying down detailed rules for the implementation of Regulation (EC) No 2152/2003 of the European Parliament and of the Council concerning monitoring of forests and environmental interactions in the Community, Division V.2: Visual assessment of discoloration

Extent: E+W+S+N.I.

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

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Source: https://www.legislation.gov.uk/eur/2006/1737/annex/I/chapter/2/division/V/division/V.2 (the official version)
Page: https://openlegislation.uk/eu-regulation-2006-1737/annex-I/chapter-2/division-V/division-V.2
Contains public sector information licensed under the Open Government Licence v3.0. Source: legislation.gov.uk, The National Archives.