We have a huge old Hickory tree on our property
that has somewhat of a hollow middle near the bottom. Is there a
way to treat this by spraying or filling the cavity with something?
Old trees typically are hollow, and often survive for many years. Once upon
a time arborists (tree care professionals) filled hollows but current
thinking is it does more harm than good. If the tree is still basically
healthy, normal growth protects it, and any intervention may actually
handicap that process. Given that, sooner or later the tree may become weak
and blow over in a storm - that's just the natural process of life and
death. So protect it from further damage, and enjoy your tree.
This may be helpful:
Anthony Brach Ph.D.
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Update: June 2012