Black spots/shriveled leaves on parking strip trees
I bought an older home in Mt. Angel last year. There are two mature trees in the parking strip on the south side of my home which leaf out beautifully, but as the season goes on, some of the leaves develop black sections and/or shrivel and fall to the ground. I end up with lots of detritus coming down (leaves + little branches) into the grass to the north. I use a push mower on the grass, so the small twigs and leaves that fall are cut and remain on the ground. I do clean up leaves ASAP when they drop in the fall, but this "dropping" of detritus that occurs from spring to summer is spread over time, and the leaves are two small to pick up - thus ending up as part of the mulch when I mow. Within the grass area are some Japanese maples; they do not _seem_ to be impacted at this point, but I worry about them! Wondering what kind of trees these are, what their issue is, and what I can do to support them. Also would like to know if I should be concerned about the Japanese maples below. Attaching three images: 1) My trees (left side of the street), and my neighbor's (right side, topped) which have the same issue; 2) a picture looking up into one of my trees; 3) a neighborhood tree that I _think_ is the same type of tree with the same problem (including this pic as I was able to get closer to a leaf to photograph) Any information/suggestions would be much appreciated! Ideally, I would like to save these trees!
Marion County Oregon