Leaf%20Spots%20%28Maple-Sycamore%29 (Rhytisma%20acerinum) - Rhytisma%20can%20affect%20both%20the%20leaves%20of%20sycamore%20and%20maple.%20Dark%20lesions%20and%20spots%20appear%20on%20the%20leaves%2C%20and%20have%20varying%20affects%20from%20minor%20aesthetic%20change%2Fdisfigurement%20to%20defoliation%20in%20severe%20cases.