Maple Leaf Spot: Phyllosticta Diagnosis and Management

9-year-old maple shows dark spots of varying sizes. Grandchildren play under tree—safety concern?

Diagnosis: Phyllosticta Leaf Spot

• Common on Amur, Japanese, red, silver maples.
• Circular tan spots with purple-red borders; black fruiting bodies in rings later.
• Late-season infection = minimal health impact, possibly earlier leaf drop.

Management

• No treatment needed for tree health.
• Rake/remove leaves in fall to reduce spores.
• If desired: spring fungicide (mancozeb/chlorothalonil) prevents spread but won't remove existing spots.

Not harmful to children. Cosmetic issue only.