# 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 (77): Needle appearance, leaf unfolding, autumn coloring and leaf fall

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

The proportion of needles or leaves of the visible part of the crown that are in the described stage or have already passed this stage is to be recorded using the following classification:
0 0 %
1 >0 – 33 %
2 >33 – 66 %
3 >66 - <100 %
4 100 %.

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Source: https://www.legislation.gov.uk/eur/2006/1737/annex/I/chapter/15/division/12/division/77 (the official version)
Page: https://openlegislation.uk/eu-regulation-2006-1737/annex-I/chapter-15/division-12/division-77
Contains public sector information licensed under the Open Government Licence v3.0. Source: legislation.gov.uk, The National Archives.