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Paul,
I thought you may find this article
by Alan Biggs useful: http://www.caf.wvu.edu/kearneysville/biggs/articles/Arbor90JA.PDF
It is rather technical, but has some great information.
I use a pruning
sealer for all bark injuries as well as pruning cuts to prevent the
entrance of any disease. Lac Balsam, also known as artificial
bark, is the worlds finest tree wound treatment. It was developed and patented
by horticulturists in Europe for use in grafting as well as tree wound sealant.
It provides protection against insect and disease organisms that are attracted
to open wounds. It comes with a brush which makes application fast and
easy. So if you do grafting, this would be my recommendation. It can
be found at http://treerx.com. If you do
no grafting, then I would recommend NuBark at http://www.saferbrand.com/store/product.asp?pf_id=2700&dept_id=71&mscssid=1 or
Tanglefoot at http://www.biconet.com/tree/pruning.html.
Hope this helps.
Dennis Norton
Royal Oak Farm Orchard
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