Division V.1 Visual assessment of defoliation

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.