First point: You are incredibly patient.
Okay, I havent read your previous thread, so apologies if this is redundant info:
Has there been anything in the past few years that may have disturbed the trees roots? Construction in the immediate vicinity? How close to other
trees, structures, or the roads? How tall/old are your maples? Any chance you have a septic system near-by? Have your neighbors done any digging or
When was that well put in and what is its proximity to the trees?
All of these things could be effecting the roots in a way that is stressing the trees. The fact that you say its not happening to other trees in the
area makes me think it;s not environmental (at least not primarily), but a problem with the trees.
The "Scorching" your pictures show (when the outer edges curl in and turn brown) is usually a sign the tree is not well. Not dying necessarily, but
being restricted by something, likely at the roots. Maybe something underground? Or maybe their outer roots have reached something limiting their
further growth (like the road, neighboring properties, etc).
here's a website that talks about it in far greater detail
I look forward to your reply.
edit on 17-6-2012 by stanguilles7 because: (no reason given)