Had a call to look at a sick 'October Glory' Maple. Four of these trees were planted on a property in a large development about 5-7 year ago to replace Elms (or possibly Zelkovas) which weren't doing well. Two planted one year, two planted the next year. Main tree pictures are the worst of the four. Two show no symptoms. One is showing some of the leaf symptoms and minor leaf drop. Spacing is about 50 feet from one tree to the next. Lawn irrigation runs 3x weekly to water bermuda lawn. Leaves started dropping 2-3 weeks ago. Last year this tree went into the fall with nice red leaves. I have a disease in mind, but I don't want to sway anyone who is willing to take a look one way or another. Any help or suggestions for definitive testing would be appreciated.