# 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.1: Visual assessment of defoliation

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

Defoliation shall be estimated annually in 5 % steps in relation to a tree with full foliage in local condition. The classification of trees into degrees of defoliation shall be carried out during the observation and shall be registered in 5 % steps.
A tree with a defoliation between 95 % and 100 %, which is still alive, is scored as 99. The score 100 is reserved for dead trees.
Class
Degree of defoliation
Percentage of needle/leaf loss
0
not defoliated
0 - 10
1
slightly defoliated
11 - 25
2
moderately defoliated
26 - 60
3
severely defoliated
61 - 99
4
Dead
100

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Source: https://www.legislation.gov.uk/eur/2006/1737/annex/I/chapter/2/division/V/division/V.1 (the official version)
Page: https://openlegislation.uk/eu-regulation-2006-1737/annex-I/chapter-2/division-V/division-V.1
Contains public sector information licensed under the Open Government Licence v3.0. Source: legislation.gov.uk, The National Archives.