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Black Spot on Large Trees: Rake Leaves, Don't Worry

Black spot on 60‑100 ft trees north of Detroit. Spraying impossible. Raking or mulching leaves reduces spores. Weather (humid/warm) drives severity. Rarely kills tree; seldom bad two years straight. Stop worrying.

Trees: Black Spots on Trees in Wet Area: Need Better Photo; Leaf Spots on Young Black Walnut: Harmless Fungi or Galls; Oak Tree Black Spots on Trunk: Need Photos for Canker ID; Mango Tree Black Spots on Branches: Check for Scale; Black Spots on New Orchid Growth: Fungal from Water on Leaves; Diagnosing Black Spots and White Scale on Cymbidium; Black Spot on Roses in Sacramento: Same Disease, Local Challenges; Black Rot on Grapes/Apples: No Threat to Walnut Trees; Diagnosing Dark Circular Spots on South Texas Lawn; Growing Grass Under Black Walnut Trees: Tolerant Species by Region

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