An "American Oak" tree problem

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[snip]

checking with a local arborist rather than Usenet replies -- arborist thinking in the U.S. opposed the use of concrete and fillers starting many years ago, because it interferes with the tree's own efforts to repair itself and is likely to lead to rotting wood and other problems. Local nurseries still sell stuff for filling in tree wounds, but that's a victory of marketing and out-of-date information over effectiveness.
Before you spend any money to "save" the tree, check with local arborists to see if this is a known problem species while it's still young and easy to replace. Your nursery may have an insecticide for the borer (that's what it sounds like you have) but you might also check with a local arborist and see if borers are a known problem with this type of tree. While it's young you might just want to replace it with a different variety, especially something that's a native tree, rather than keep trying to save a tree that's in the wrong region and in steady decline --
If you're at one of the American bases in Germany you may be able to find someone in Civil Engineering with local knowledge of trees and a list of problem species.
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the hole will not get any bigger as the tree grows and as long as water is not allowed to get into the hole it wont rot. Most of any tree is dead, in fact, 98% of a redwood is dead wood. the only part of the tree that is alive is right under the bark, the leaves, the roots. at this point I would be worried about that something eating or laying eggs in the hole, so I would flush with an insecticide. then tape the hole shut without encircling the whole trunk. as the tree grows the bark/growing layer will grow out until it meets and closes the entrance (more or less).
On Mon, 11 Jun 2007 19:16:08 +0200, "Charles T. Smith"

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Good news! Thank you.
On Tue, 12 Jun 2007 09:41:28 -0500, dr-solo wrote:

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