Been reading Shigo the last few days. This seems to fit here a bit.
Multiple Wounds: A central 10-year-old wound with a central column of discolored wood. A 2-year-old wound with a small column of discolored wood did not spread into the older, more central column. (fig. 63)
I swear i'm not...
Heres one such scenario, the only pic I have but i'd chalk that up to there being nothing special about a small pocket of decay making it not very picture worthy
How many trees have you cut down that had decay pockets, fractures etc but were otherwise sound wood? Butt rot in cedar and hemlock very often leaves just a shell that is pretty consistent around the tree. Not sure which part you want defended so trying to cover all bases.
Not really. You could run a wire in to the end of the hole and compare against the plug if you dont break it. Still not truly documented. I'm not bashing it as they are handy and perhaps more important than the cavity is that it can document the shell thickness.
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