Quick answer
Most brown patches in Oklahoma Bermuda lawns come from one of five causes: drought stress, mowing too short, compacted soil, grubs, or fungal disease. The pattern and timing usually tell you which one.
Match the Pattern to the Cause
Walk the lawn and look closely at the edges of the brown area before treating anything.
- Brown in the sunniest, highest spots in July or August: usually drought stress
- Brown stripes or patches right after mowing: scalping from a low deck height
- Brown along sidewalks and paths: compaction and heat from concrete
- Turf that peels back like carpet: grub damage to the roots
- Circular patches that appear in cool, wet weather: possible fungal disease
Quick Tests You Can Do
Tug on the brown grass. If it lifts easily with no roots, look for grubs in the top few inches of soil. If it's firmly rooted, the problem is more likely water, heat, or mowing.
Push a screwdriver into the soil. If it's very hard to push in, compaction is limiting water and roots.
How to Fix It
Raise the mowing height during summer heat, water deeply and less often in the early morning, and core aerate compacted areas. Grubs and disease need correct identification before treatment.