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Often, usually after a heavy rainfall, you'll observe an unusual growth in the lawn. The growth is probably a fungus, but that doesn't necessarily mean disease. Some questions to answer during your inspection are: Are leaves yellowing and/or decaying? Is the growth covering the plant and shutting out light? Did the growth appear suddenly, or has it been building over time?
Unless the grass is clearly suffering, the fungus is probably harmless and you can leave it alone. Fungi often appear quite suddenly, only to disappear just as suddenly when conditions change. Fungicides are expensive treatments that can cause some environmental damage. Don't use them unless you legitimately believe your lawn is at risk.