Brown Patch in Central Texas: How to Identify, Prevent, and Treat Lawn Fungus

Is brown patch damaging your lawn in Central Texas? Brown patch is a common lawn disease that appears during the cooler, wetter months of fall and spring. This fungal disease most often affects St. Augustine grass, but it can also damage Bermuda and Zoysia lawns when conditions favor its development.

The good news is that you can take steps to prevent brown patch, limit its spread, and help your lawn recover. Learn how to identify brown patch fungus, adjust your lawn care routine, and protect your grass with these practical tips.

What Causes Brown Patch in Central Texas Lawns?

Brown patch develops when cool temperatures and moist conditions create a favorable environment for fungal growth. In Central Texas, these conditions typically occur during the fall and spring as temperatures begin to cool.

Overwatering and overfertilizing increase your lawn’s susceptibility to brown patch. Excess moisture encourages fungal growth, while improper fertilizer applications can make your lawn more vulnerable to disease.

St. Augustine grass is particularly susceptible to brown patch, although Bermuda and Zoysia grass can also develop the disease.

If brown patch has affected your lawn in previous years, watch for it again when cool, damp weather returns.

How to Identify Brown Patch Fungus

Recognizing brown patch early can help you take action before the damage spreads.

Look for these common signs of brown patch in your lawn:

• Circular brown patches: Infected areas often appear as roughly circular patches of discolored grass.
• Brown leaf blades: The grass blades turn brown while the underlying runners remain green.
• Easily detached leaves: Brown leaves often pull away from the runners easily because the fungus damages the leaf tissue.
• Donut-shaped patches: As the grass begins to recover, the center of a brown patch may turn green while the outer edges remain brown, creating a donut-like appearance.
• Slow spring recovery: Damaged areas may take longer to green up, and weeds may invade thin or bare spots.

Brown patch primarily damages the leaf blades rather than the roots and runners. As a result, the grass can often recover when conditions become less favorable for the disease.

Tip: If you notice recurring brown patches in your St. Augustine lawn during cool, wet weather, consider brown patch as a possible cause. Other lawn problems can produce similar symptoms, so confirm the diagnosis before applying a treatment.

How to Prevent Brown Patch in Your Lawn

You can reduce the risk of brown patch by adjusting your watering habits, improving drainage, and maintaining a healthy lawn.

1. Water Your Lawn at the Right Time

Brown patch fungus thrives in moist conditions. Adjust your irrigation schedule during the spring and fall to help reduce prolonged moisture on grass blades.

Water your lawn early in the morning, ideally before sunrise or around sunrise, so the grass has time to dry as the day progresses.

Avoid frequent watering that keeps your lawn consistently wet. Instead, adjust your irrigation schedule to your grass type, soil conditions, rainfall, and seasonal needs.

2. Improve Drainage and Eliminate Standing Water

Low spots in your lawn can collect water and create conditions that favor fungal growth.

Fill low areas where water puddles, and address drainage problems that keep your soil or grass excessively wet. Better drainage helps reduce prolonged moisture and supports healthier turf.

3. Avoid Overfertilizing

Too much fertilizer can increase your lawn’s susceptibility to brown patch, especially when you apply it at the wrong time or rate.

Follow the recommended fertilizer schedule for your grass type and season. Avoid excessive nitrogen applications, particularly when cool, wet weather increases the risk of fungal disease.

A balanced lawn care program helps your grass maintain healthy growth without encouraging unnecessary stress or disease susceptibility.

How to Treat Brown Patch Fungus

Brown patch is considered a self-limiting lawn disease. When temperatures and moisture levels no longer favor fungal growth, the disease generally becomes less active, allowing healthy grass to recover.

However, you can support recovery and reduce future problems by combining proper lawn care with an appropriate treatment when needed.

Use MicroLife Organic Biological Fertilizer

At Backbone Valley Nursery, we recommend considering MicroLife Organic Biological Fertilizer as part of a lawn care program for areas that have experienced brown patch.

Apply the fertilizer in the spring and fall to previously affected areas or across the lawn as part of your preventative maintenance routine.

MicroLife Organic Biological Fertilizer provides turf nutrition and beneficial microorganisms that support soil health.

Recommended application rate:

• Apply 40 pounds per 5,000 square feet.
• Treat previously affected areas or the entire lawn, depending on your lawn care needs.
• Follow the product label for application instructions and any additional precautions.

Healthy soil and appropriate turf nutrition can support lawn recovery, but fertilizer should not replace proper watering, drainage, or disease management.

Consider Chemical Fungicide Treatments

Chemical fungicides may help manage brown patch when environmental conditions favor disease development or when symptoms persist.

Consult the knowledgeable staff at Backbone Valley Nursery for recommendations on products appropriate for your grass type and situation.

Always follow the product label for application rates, timing, safety precautions, and restrictions.

Important: If you plan to treat brown patch with a fungicide, select a product labeled for the disease and your turfgrass species. Fertilizers and fungicides serve different purposes, so do not assume that a fertilizer alone will control an active fungal infection.

Treat the Entire Affected Area

When applying a treatment, cover the affected areas thoroughly. Extend treatment approximately 3 feet beyond the visible edges of each patch when the product label permits this coverage.

Treating beyond the visible damage can help address the surrounding area where the disease may be developing.

Always follow the product label and avoid applying more product than recommended.

Can Brown Patch Kill Your Lawn?

Brown patch typically damages grass blades rather than killing the roots and runners. Once conditions become less favorable for the fungus, surviving grass can begin to recover.

However, recovery may take time, especially when the disease affects large areas or repeatedly returns. Weeds can also invade weakened sections of your lawn, making recovery more difficult.

Maintain proper irrigation, improve drainage, avoid overfertilizing, and address recurring disease problems to help your lawn recover and reduce the likelihood of future outbreaks.

Special note for newly installed lawns: If your lawn is less than one year old, avoid synthetic chemical treatments unless a qualified professional confirms that the product is appropriate for your turf and the product label permits its use. Newly established grass may require a different approach to disease management.

Protect Your Central Texas Lawn From Brown Patch

Brown patch can frustrate homeowners, especially when it returns every fall or spring. Fortunately, the right lawn care practices can help you manage the disease and encourage healthy turf.

Remember these key steps:

• Water early in the morning to help grass blades dry.
• Avoid overwatering and excessive fertilizer applications.
• Improve drainage in areas where water collects.
• Consider MicroLife Organic Biological Fertilizer as part of your lawn care program.
• Consult a lawn care professional or nursery specialist when you need help identifying or treating brown patch.

With proper care and timely treatment, you can help your lawn recover and prepare it for the next growing season.

Need help with brown patch in your Central Texas lawn? Visit Backbone Valley Nursery for guidance on lawn care products, fertilizer, and disease management. Our team can help you choose an approach that fits your grass type and lawn care needs.