Knowledgebase
Black spots on leaves #936355
Asked June 22, 2026, 12:08 PM EDT
Washington County Oregon
Expert Response
Thank you for reaching out to Ask Extension. It looks like your maple has anthracnose, which is a fungal disease that causes defoliation.
Here is more information about anthracnose in maples: Maple (Acer spp.)-Anthracnose | Pacific Northwest Pest Management Handbooks and Maple Anthracnose : Landscape : Center for Agriculture, Food, and the Environment (CAFE) at UMass Amherst
Feel free to reach out if you have additional information or questions.