Any help appreciated. We have a couple of trees in our front yard in Hunt Meadow in Annapolis that are struggling. Here are a couple of photos of two silver maple trees (I think) with issues which have shown up this spring. The trees are about 25 years old and 30' tall. One is a diminished number of leaves this year and the other has all leaves but some black spots on leaves. They are in the front yard next to each other.
Anne Arundel County Maryland
We would suggest a visit from a certified arborist for an onsite observation. You can find one by visiting the attached link. http://www.treesaregood.org/
They will not charge you for the visit and provide an estimate for what is needed to save the trees.