Take-All Root Rot

Also known as: Bermudagrass decline

Pathogen: Gaeumannomyces graminis var. graminis

Identification

Symptoms

Yellowing turns brown or wilted
Thinning patches from 1 ft to more than 20 ft
Black rotted roots

Season: Mar, Apr, May, Jun, Jul
Regions: South, Transition Zone, Warm West (CA / AZ / NM)
Turf Hosts: Bermudagrass, St Augustinegrass, Zoysiagrass

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Sources

NC State Extension - Take-All Root Rot in Turf
Penn State Turfgrass Pest Diagnostic Lab - Take-All Root Rot and Bermudagrass Decline
Texas Plant Disease Handbook - Take-All Patch / Bermudagrass Decline

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.