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Black Mold on Lawn: Slime Mold vs. Snow Mold

Slime Mold

Appears after prolonged rain/humidity as creamy white slime turning gray/blue‑gray. Grows on leaf surfaces, not parasitic. Brush off with broom/rake. Prevent by watering early, deeply, infrequently.

Snow Mold

Occurs early spring after snow on unfrozen ground. Circular patches, may persist into summer. Treat with fungicide if needed.

Diagnosis

North‑side shade + moisture suggests slime mold. Improve airflow, reduce irrigation frequency, increase sunlight if possible.

Lawns: Black Slime Mold Identification: A Call for Photo Submission; Black Mold on Young Tree: Aphids and Sooty Mold Fix; Diagnosing Black Discoloration in Lawn; Lawn Mold, Fungus, or Moss? Diagnosis and Fix; Black Lawn Mold (Stripe Smut): Don't Fungicide—Fix the Culture; Identifying and Treating Black Mold on a New Hydroseeded Lawn; Managing Puffball Mushrooms in the Lawn; Black Mold on New Lawn: Identification and Treatment; Black Mold on Newly Seeded Lawn: Adjusting Irrigation to Eliminate Fungus; Green Mold and Rust on Newly Seeded Lawn: Normal and Temporary

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