Any ideas

[coolbrze]

There are quite a few Kwanzaan & Yoshino Cherry trees in Northern VA that have started to decline over the last few years. Most start in the summer by losing their leaves. Any ideas whats causing this, not seeing any evidence of pests...

 

[Del_]

Leaf diseases causes long term decline.

 

[Raintree]

After ruling out your key pests for cherries, look at environmental stresses.