Hi Walt,
There is a fungal disease called cherry leaf spot aka shot hole fungus.* Is this what you see?
http://ohioline.osu.edu/hyg-fact/3000/3021.html
If that is it and you choose to use a commercial fungicide, know that it should NEVER be used near children or pregnant women.* I would recommend trying a homemade remedy first.* The apple cider fungicide would be a good one to use as the fungicides that work against cherry leaf spot also work against scab.
http://www.ghorganics.com/page15.html
Newt
When weeding, the best way to make sure you are removing a weed and not a valuable plant is to pull on it. If it comes out of the ground easily, it is a valuable plant.