Some kind of blight on Sour Cherry Trees
My sour cherry trees are having a problem. I've got loads of fruit, but they are getting some kind of blight or disease. This happened last year, and wiped out the whole crop. The tree themselves seems to be fine, just the fruit is affected. It starts off as tiny brown spots, then the spots grow and eventually consume the fruit. Help!! What is it and what, if anything, can I do about it? Pics attached. Thanks in advance!
Hennepin County Minnesota