There are a lot of articles on the web ranked highly in searches that advocate the use of tar/tar based products to seal tree wounds such as pruning cuts. For example — "Homemade tree wounds". However, this is really an outdated practice and the use of such products only seals in the bacteria and fungus, further worsening the situation and accelerating the decay.
Are there concrete sources of information (published literature/university program articles, etc.) that go into further detail on the benefits/hazards of using tar based products for such purposes? I'd appreciate detailed answers with links so that this post can quell any disinformation floating around on the internet.