Black Spots on Maple Leaves: Tar Spot Fungus—Rake Leaves, Reduce Inoculum, Tree Usually Fine

Identification

Dark black, raised spots = tar spot (Rhytisma spp.). Cosmetic, rarely harms tree health.

Management

• Rake and destroy ALL fallen leaves before spring budbreak.
• Burn if allowed; otherwise bag for trash.
• Reduces spores for next year.
• Spraying large trees impractical; not needed if tree watered/fertilized.