Could you please help us identify what is causing the dark spots on our Green Ash tree leaves? We have two large Green Ash trees we have been treating for Emerald Ash Borer, but both are starting to show signs of stress. Both trees have had Anthracnose for several years, but this year and last, the leaves have dark spots and both trees drop many of these affected leaves. What ailment is causing this and do we need to be careful about disposing of these leaves so as not to infect other trees? Thank you!