Hole in oak tree that collects water and rots
I have a HUGE oak tree in my byard. The railing of the deck was built around the tree. Long before I bought the place, one of the main branches was removed (probably 20 years ago?). There is a big hole there in the middle of the main trunk, and water collects in there after each rain. The water is smelly and rotten. I gotta believe that this is NOT good for the tree. My neighbors had the same thing and they just waited for summer to dry out and then poured cement in the hole to prevent water from collecting. I thought that was a bad idea, but now I am wondering? Is that a bad idea for the health of the tree? Are there alternatives? I was considering drilling a half-inch hole thru the bottom-side of the trunk and inserting a rubber tube to allow drainage. Any expert recommendos?
Thanks in advance,