roseman
Answered on August 11, 2012
If the bark has split clear down to the interior wood, then it needs to be sealed to keep insects out and prevent disease. There is a tar like product called Tree Wound Sealer on the market. Most garden centers have it. I believe ACE hardware carries it as well. Apply such a product to the split working it well into the split. Once done sprinkle it lightly with a fine sand to help make it less sticky, thus it will stay in place better if anything brushes against the treated area.
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