I have a decent sized hole in a fairly old apple tree (not sure how old, or what variety - nice summer apple). The hole is about 8 inches deep at a major junction on a big part of the trunk. I am thinking that it should be sealed, so I don't lose that entire part of the tree. Why does this happen, and what should I do about it - seal it up? Thanks in advance for the advice.
A couple of pictures I took while out pruning today. Note that I am saving some water sprouts to graft onto another tree.
I had to turn my images off so I could post. You should make them alot smaller.
I have filled large holes with that expanding foam that comes out of a can, but only in August or September when the whole hole has had a chance to dry out completely. After the sprayfoam cures, you can come along with some roofing patch and protect the foam from rain. Anything to prevent more water from getting in.
Good luck!
One of the holes of mine was soo deep I had to use a siphon tube to get all the water out, one tubeful at a time using mouth for suction. Don't get any in yer mouth! It'll have mosquito larvae in it!
Probably should have drilled a hole in the side and just let the water out that way...
Thanks for resizing.
I’ve actually bored a half inch hole at the base of a pear tree cavity. Each year, while pruning, I jam a watershoot up through to clear it of leaves, debris and very murky water. I like the idea of waiting until the bone-dry of summer to spray in some foam, I’ve never tried that…
I wonder how deep that hole is? I’ve also got one inside a Gravenstein apple trunk five feet long and a good foot in diameter! Probably too late for foam 
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