".... The limb was about 6 inches in diameter. I cut the stub at an
extreme angle so the water would run off. This creating an oval area about
18" by 8" of exposed wood....."
First thing I would do is to cut the remains off level with the trunk
(Vertical) to give the smallest area, you have created an area for the water
to hold on the cut wood, also it will take years for the tree to grow over
such a protrusion, so more chance of serious harm to the tree.
when cutting a branch off of a tree, cut just a few inches (in this case, a
few inches because it's a large branch) above the bulge where the branch
joined up with the trunk. Yes in cutting the branch off properly, you allow
it to heal right. Sealing it up WILL seal in bacteria and not allow it to
heal right. And if the branch was dead, chances are it's already sealed
itself, so be sure not to cut it off too closely to the trunk..........
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