Leaf Spot / Melting-Out

Pathogen: Bipolaris spp., Drechslera spp., Exserohilum spp.

Identification

Symptoms

Brown to purple leaf spots with tan centers
Thinning or crown/root decline during melting-out phase
Common in spring and fall

Season: Mar, Apr, May, Sep, Oct, Nov
Regions: All Regions
Turf Hosts: Kentucky Bluegrass, Perennial Ryegrass, Fine Fescue, Bentgrass

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Sources

Penn State Turfgrass Pest Diagnostic Lab - Pyrenophora Leaf Spots (Leaf Spot / Melting Out)
Rutgers FS102 - Lawn Disease Seasonality

This is identification help, not a diagnosis. Symptoms described here can overlap between diseases and other causes (drought, wear, nutrient deficiency). When you're not sure, or before applying any treatment, contact your state's Cooperative Extension office - most offer free or low-cost diagnosis and know your local conditions best.