How to fix brown patches in your lawn
Fungus, grubs, chinch bugs, drought, or dog spots — how to tell, and the fix.
By The T.A.P. Team · August 2024 · 6 min read
Brown patches in a North Texas lawn have several possible causes, and the fix depends entirely on which one you've got: fungal disease (brown patch/large patch), grubs eating the roots, chinch bugs in St. Augustine, simple drought stress, or dog-urine spots. Guessing wrong wastes money and time. Here's how to diagnose the cause from the pattern and symptoms — and what actually fixes each.
- 1Circular patches, spreading in humidity? Fungus.
- 2Grass pulls up easily like carpet? Grubs.
- 3Yellow/brown spread in hot sun, St. Augustine? Chinch bugs.
- 4Dry, dull, footprints linger? Drought stress.
- 5Small round spots along pet paths? Dog urine.
Fungal disease (brown patch / large patch)
Roughly circular brown rings or patches that expand, especially in the humid transitions of spring and fall, usually mean fungal disease — often triggered by overwatering or evening watering that leaves grass wet overnight. The fix starts with culture: water early morning and less often, improve airflow, and apply a lawn fungicide if it's advanced.
Grubs
If the grass in a browning area lifts up like a loose piece of carpet — because the roots have been eaten — you have grubs (beetle larvae). Confirm by pulling back a patch and looking for white C-shaped larvae in the soil. Treat with a grub-control product applied at the right time of year; heavy infestations may need a pro.
Chinch bugs
Chinch bugs attack St. Augustine in the hottest, driest, sunniest parts of the lawn, causing irregular yellow-to-brown patches that spread outward and don't green up with water. They're a classic Texas summer pest on St. Augustine. Confirm and treat with the appropriate insecticide, and keep the lawn properly watered.
Drought stress vs. pet spots
Drought stress shows as a whole-lawn dull, blue-gray cast with footprints that stay pressed down — fixed by proper watering, not chemicals. Dog-urine spots are small, round dead patches (often with a lush green ring around them) along the dog's routes — flush them with water. Matching the treatment to the real cause is the whole game; see why is my grass dying.
| Symptom | Likely cause | What to do |
|---|---|---|
| Circular patches, humid weather | Fungal disease | Fix watering; fungicide if needed |
| Grass lifts like carpet | Grubs | Grub control at the right time |
| Spreading spots in hot sun (St. Aug) | Chinch bugs | Treat; keep watered |
| Whole lawn dull, footprints stay | Drought stress | Water deeply and properly |
| Small round spots by pet paths | Dog urine | Flush with water |
You can DIY
- Correct watering (morning, less often)
- Flush pet-urine spots with water
- Apply grub/insect control per label
- Improve airflow and mowing
- Check the root zone for grubs
Call a pro
- Persistent or spreading disease
- Heavy grub or chinch-bug infestation
- Diagnosing an unclear cause
- Lawn renovation / re-sod
- Recurring problems every year
The costly mistake with brown patches is reaching for a product before identifying the cause — spraying fungicide on a grub problem, or fertilizer on a fungus, just wastes money and time. Read the pattern first: circular and humid = fungus, lifts like carpet = grubs, hot dry spread on St. Augustine = chinch bugs, whole-lawn dull = drought. Match the fix to the cause and the lawn recovers.
Brown-patch season in DFW
North Texas gives lawns the full menu — humid springs and falls bring fungus, hot dry summers bring chinch bugs and drought stress. We diagnose and treat struggling lawns across Plano, McKinney, and Southlake. See our landscaping team.
The short version
- Brown patches have several causes — the fix depends entirely on which one.
- Circular patches spreading in humid weather usually mean fungal disease.
- Grass that lifts up like carpet means grubs are eating the roots.
- Spreading spots on St. Augustine in hot sun point to chinch bugs.
- A whole-lawn dull look with lingering footprints is drought stress.
- Diagnose the pattern before you treat — the wrong product wastes money.
Brown patches — frequently asked questions
Lawn full of brown patches?
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