There is no need to damage trees with diagnostic methods for risk assessment, providing the tree assessor has knowledge of visual decay symptoms and their significance.
Depending on the tree species, vitality and the invasiveness of the causal decay fungus, some trees have a good ability to form strong boundaries and, subsequently, compensation.
As long as the bark, cambium and xylem are intact, trees are capable of laying down new tissue and to compensate for wood decay in the centre of the stem or roots for many years and in some instances probably for decades. Thus trees can effectively counteract wood decay if cambial activity is strong, resulting in compensatory growth that enhances the strength and stability of the tree.
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