# 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 IV.6: Phases to be monitored

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

In principle, all phenological phases are of interest for phenological monitoring. However, from the practical point of view (e.g. financial input, ease and reliability of the monitoring, European-wide comparability, compatibility with other surveys like Crown Condition) it is necessary to concentrate on a limited set of phases and on the major species or groups of species.
A distinction is made between conifers and broad-leaved species:
Conifers
Broad-leaved species
Needle appearance
Leaf unfolding
Lammas shoots
Secondary flushing
Flowering
Flowering
Autumn coloring
Leaf death and leaf fall
For the flowering phase, only the beginning of opening of the male flowers (characterised by pollen shed) is to be recorded, whereas the other phases are to be recorded quantitatively. In addition, damage to needles, leaves or flowers caused by late frost in spring should also be recorded, as well as its intensity. The definitions and determinations of the individual phases are described hereafter.

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Source: https://www.legislation.gov.uk/eur/2006/1737/annex/I/chapter/12/division/IV/division/IV.6 (the official version)
Page: https://openlegislation.uk/eu-regulation-2006-1737/annex-I/chapter-12/division-IV/division-IV.6
Contains public sector information licensed under the Open Government Licence v3.0. Source: legislation.gov.uk, The National Archives.