Well, you could cut out a section of the bark totally around the
trunk of the tree. Do it about 6" wide. The tree will be exposed to
the elements and won't be able to recover. This will take at least 2
to 3 years to kill the tree. Best to just cut them down for safety
sake. I don't use poisons so I can't help you there. http://www.backyardgardener.com/treeboard/messages/890.html
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