I see. Maybe you can provide that photo-link to the public also. Or you can try to upload them in a smaller size, for example from this provider: http://picr.de
. Maybe other people could recognize it as something that I don't know.
As far as I can perceive, it must be this moniliana-desease:
http://www.ent.uga.edu/peach/peachhbk/f ... ownrot.pdf
At least this is very common for plum and cherry trees.
The problem is: there is no real helpful remedy. Nothing to spay once to finish the problem. You can try it with an anti-funghi chemical pesticide, but this might not be very ecological and also not effective. You have to look, what kind of stuff is available.
All you can do is trying to strengthen the tree and observe how he is doing. To cut of the infected branches might be a valid measure, but the funghi is inside. Nevertheless, I know a cherrytree that improved by persistent caretaking - and two trees improved just by better weather after some years.
Possible ecological measures:
Cutting off sick branches,
Spray with a fresh or fermented tea from Equisetum arvense
, diluted with water 1:10. This strengthens especially leaves.
After spraying throw some "rock flour"* on the leaves and affected areas.
(* I don't find the word in English. It is some milled grey stone, used as mineral fertilizer in ecological gardening.)
In our retreatplace there is a big walnut tree, and it seemed to be dying. It was too big for me to cut it. I'm not so courageous to climb any tree of any heighth. So, since I was taking care of the offerings on the altar when we held Nyung Me ritual there, I watered that tree with the safran water from the offering bowls, for four days. Next year the tree looked much better.
Sometimes those trees can manage improving with the help of their own self-regulating forces and by other positive outside conditions.
I saw one cherry tree improving by nothing. Only some people making music near to it regularily.
But if the sickness grows mighty and the stem doesn't provide any stability anymore, maybe you have to cut it down. But until then one can give the trees some time and observe them.