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The yellowing of leaves and the decay of grass roots is the first symptom of Take-All Root Rot followed by the turf thinning in irregular shapes. The roots can become so rotted that grass can easily be pulled up. Take-All Root Rot spreads mainly from fall through spring when there is abundant moisture and cool, mild temperatures. The dieback symptoms appear in the hot stressful days of summer. Take-All Root Rot attacks St. Augustine, Zoysia and Bermuda and could eventually kill the entire lawn.
Do you have good drainage in your yard? Water standing for long periods can cause problems. Level low areas, and aerate your yards with heavy clay soil at least once a year to improve drainage and reduce soil compaction. If water flowing from drains is the problem, consider French drains or a dry creek bed.
Avoid heavy fertilization of the turf area as excessive nitrogen seems to promote Take-All Root Rot.
Raise mowing height to reduce stress and avoid broadleaf herbicides.
Betty Hicks, Smith County Master Gardener
Texas AgriLife Extension Service