Protecting Your Lawn from Brown Patch, Large Patch, and Zoysia Patch

A healthy lawn is one of the most valuable features of any property, but even the best-maintained turf can fall victim to fungal diseases. For homeowners with St. Augustine and Zoysia grass, three of the most common and damaging turf diseases are brown patch, large patch, and zoysia patch.

These diseases can quickly turn a lush green lawn into an unsightly patchwork of yellow, brown, and thinning turf if left untreated.

At Top Notch Turf & Pest, we help homeowners throughout Arkansas and Texas identify, treat, and prevent turf diseases before they cause significant damage. Understanding the symptoms and risk factors of these diseases is the first step toward maintaining a healthy, beautiful lawn.

What Causes Turf Diseases?

Most turf diseases are caused by naturally occurring fungi that become active when environmental conditions are favorable. Factors that commonly contribute to disease development include:

• Excess moisture
• Prolonged leaf wetness
• High humidity
• Poor air circulation
• Excessive nitrogen fertilization
• Overwatering
• Compacted soils
• Thatch accumulation

When these conditions exist, fungal pathogens can rapidly spread throughout susceptible turfgrass.

Brown Patch in St. Augustine and Zoysia Lawns

What Is Brown Patch?

Brown patch is a fungal disease caused by Rhizoctonia solani. It commonly affects both St. Augustine and Zoysia lawns during periods of warm temperatures and high humidity.

The disease is most active when nighttime temperatures remain above 65°F and moisture levels remain elevated.

Symptoms of Brown Patch

Common signs of brown patch include:

• Circular brown patches ranging from a few inches to several feet in diameter
• Yellow or orange borders around affected areas
• Thinning turf
• Leaf blades with dark lesions
• Rapid spread during humid weather

Many homeowners mistake brown patch for drought stress, insect damage, or fertilizer burn.

Why Brown Patch Develops

Several factors increase the likelihood of brown patch outbreaks:

• Excessive irrigation
• Watering late in the evening
• Heavy nitrogen applications
• Poor drainage
• Thick thatch layers
• Prolonged humidity

These conditions create an ideal environment for fungal growth and disease development.

Large Patch Disease

What Is Large Patch?

Large patch is another disease caused by Rhizoctonia solani, but unlike traditional brown patch, it primarily affects warm-season grasses as they enter or exit dormancy.

Large patch is particularly common in:

• St. Augustine grass
• Zoysia grass
• Centipede grass

The disease typically becomes active during cooler temperatures in the fall and spring.

Symptoms of Large Patch

Large patch often appears as:

• Large circular patches of yellow or brown turf
• Rings measuring several feet in diameter
• Orange or bronze discoloration
• Thinning grass in affected areas
• Delayed spring green-up

As the disease progresses, the center of the patch may begin recovering while the outer edges continue expanding.

Why Large Patch Is So Common

Many homeowners unknowingly create ideal conditions for large patch by:

• Applying excessive fertilizer in the fall
• Watering too frequently
• Allowing moisture to remain on turf overnight
• Maintaining poor drainage conditions

Because the fungus attacks roots and crowns, recovery can take several months even after successful treatment.

Zoysia Patch: A Unique Challenge for Zoysia Lawns

What Is Zoysia Patch?

Zoysia patch is a specific manifestation of large patch disease that primarily affects Zoysia turf.

Because Zoysia grass is prized for its dense growth and attractive appearance, disease outbreaks can be especially noticeable and frustrating for homeowners.

Symptoms of Zoysia Patch

Typical symptoms include:

• Large yellow, orange, or brown patches
• Circular patterns throughout the lawn
• Thin, weakened turf
• Delayed green-up in spring
• Slow recovery during the growing season

In severe cases, patches may continue expanding year after year if left untreated.

Why Zoysia Is Vulnerable

Several factors increase disease pressure in Zoysia lawns:

• Excessive thatch accumulation
• Poor air circulation
• Overwatering
• Improper fertilization practices
• Extended periods of cool, damp weather

Since Zoysia naturally forms a dense canopy, moisture can remain trapped within the turf, creating favorable conditions for disease activity.

How to Differentiate Between Brown Patch, Large Patch, and Zoysia Patch

While these diseases can appear similar, proper identification is critical.

Brown Patch

• Most active during warm, humid periods
• Causes leaf lesions and rapid discoloration
• Common during summer months

Large Patch

• Most active during cooler spring and fall temperatures
• Attacks roots and crowns
• Often causes delayed spring recovery

Zoysia Patch

• Specifically impacts Zoysia grass
• Creates large circular areas of discoloration
• Often persists from season to season

At Top Notch Turf & Pest, our trained lawn care specialists accurately diagnose turf diseases and recommend targeted treatment plans based on the specific pathogen affecting your lawn.

Prevention Is the Best Defense

Disease prevention starts with proper lawn care practices.

Water Properly

Water deeply and infrequently rather than applying light daily irrigation.

Best practices include:

• Watering early in the morning
• Avoiding evening irrigation
• Preventing standing water
• Improving drainage when necessary

Maintain Proper Fertility

Overfertilization can contribute significantly to disease pressure.

A balanced fertility program helps:

• Strengthen root systems
• Improve turf density
• Reduce stress
• Enhance disease resistance

Reduce Thatch Accumulation

Excessive thatch traps moisture and creates an ideal environment for fungal growth.

Services such as:

• Core aeration
• Dethatching
• Soil improvement

can help reduce disease risk.

Professional Disease Management Matters

Many turf diseases look similar to insect damage, drought stress, herbicide injury, or nutrient deficiencies. Misdiagnosis often leads to ineffective treatments and continued turf decline.

Professional lawn care specialists can:

• Accurately identify disease symptoms
• Evaluate contributing environmental conditions
• Implement proper fungicide programs
• Monitor recovery
• Recommend cultural corrections

The earlier a disease is diagnosed, the better the chances of minimizing turf damage.

How Top Notch Turf & Pest Helps Protect Your Lawn

At Top Notch Turf & Pest, we understand the unique disease pressures facing lawns throughout Arkansas and Texas. Our lawn health professionals provide comprehensive turf disease management designed to protect your investment and keep your lawn looking its best year-round.

Our services include:

• Professional turf disease identification
• Brown patch treatment
• Large patch management
• Zoysia patch control
• Lawn health evaluations
• Fertilization programs
• Aeration recommendations
• Preventative disease monitoring

We don't just treat symptoms. We focus on improving the overall health of your lawn to reduce future disease outbreaks and promote long-term turf success.

Don't Let Turf Diseases Take Over Your Lawn

Brown patch, large patch, and zoysia patch can quickly impact the appearance and health of your lawn. Early detection, proper diagnosis, and professional treatment are essential for preventing long-term damage and encouraging rapid recovery.

If you're noticing discolored patches, thinning turf, or unusual areas of decline in your St. Augustine or Zoysia lawn, the experts at Top Notch Turf & Pest are here to help.

Contact Top Notch Turf & Pest

Arkansas Office

📞 501-607-1991
📧 [email protected]

Texas Office

📞 281-796-9600
📧 [email protected]

🌐 www.mytntlawn.com