On 12/30/2011 10:04 AM, Don Phillipson wrote:
"Matt" wrote in message
...

I have a couple of big silver maples, 40 years old and about three feet in
diameter. . . .
What is the best way to stop the damage and make the trees live longer?

If your trees have grown to 3 ft. diameter in 40 years, they seem
so exceptioally vigorous you need do nothing to make them live longer.



Maybe it is out of character for a Canadian, but you may not be familiar
with silver maples. They grow very fast. Not so exceptional for them.
And the neighborhood is as old as the trees, so there were no other
trees to shade them out. The ground is pretty wet here too.