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Tree Cavity Filling
Filling cavities in otherwise healthy trees may help improve appearance, promote wound closure and prevent water and animals from entering the hollow. While it will not cure decay, proper cavity treatment (in combination with regular pruning, feeding and insect/disease control) may help improve a tree's defenses.
The tree surgeon must exercise extreme caution so as not to wound the live tissue while excising the decay from the tree as this will compromise the compartmentalization of the wound.