What Is Patch Disease?

Patch diseases are a group of fungal diseases that attack lawns, particularly those that suffer from excessive thatch, poor soil or too much or too little nitrogen. Patch diseases typically show up as rings or semicircles of dead grass. For example, brown patch comes from the Rhizoctonia solani fungus. It can attack a wide variety of grasses, usually in wet and hot mid-summer conditions. Summer patch comes from the Magnaporthe poae fungus. Patch diseases are best prevented by correcting poor cultural practices and ensuring appropriate soil nutrient levels. After an outbreak, patch disease treatment may include overseeding, applying fungicide, and amending the soil to correct nutrient imbalances.

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Other diseases that may cause brown patches on your lawn include Fusarium Patch, Necrotic Ring Spot, and Dollar Spot.