If you’re a South Florida homeowner worried about unsightly brown patches in your lawn, you’re not alone. Brown patch disease, caused by the fungus Rhizoctonia solani, is a common issue that can leave your once-vibrant lawn looking patchy and weak. With the right knowledge and care, you can diagnose and treat brown patch effectively to restore your lawn’s health.
What Is Brown Patch Disease?
Brown patch disease is a fungal infection that primarily affects warm-season grasses like St. Augustine, Zoysia, and Bermuda—common in South Florida landscapes. The fungus attacks the grass blades, causing them to wilt, discolor, and die off in circular or irregular patches. Brown patch is most active in conditions where nighttime temperatures range between 60-75°F and moisture levels are high, such as after heavy rains or consistent dew.
The disease can spread rapidly if left unchecked, turning small spots into widespread damage. Understanding the environmental and cultural factors that contribute to its growth is key to controlling it effectively.
Brown patch disease in St. Augustine lawn in South Florida
If you’re unsure whether your lawn is dealing with brown patch, examine the affected areas closely. Proper identification is crucial to applying the correct treatment.
Signs Your Lawn Might Have Brown Patch
Detecting brown patch early can save your lawn from extensive damage. Keep an eye out for these common signs:
- Circular or Irregular Patches: These areas typically start small but can grow to several feet in diameter. The edges of the patches may appear darker or water-soaked.
- Yellow or Tan Blades: Affected grass blades take on a yellow, tan, or light brown color. In some cases, the blades will have a burnt appearance.
- Soft, Rotting Blades: When touched, infected blades may feel slimy or soft. They often pull away easily from the soil.
- Yellow Halos: You might notice faint yellow rings or halos around the brown patches as the disease progresses.
What Causes Brown Patch?
Brown patch disease is often triggered by:
- Excess moisture: Overwatering or poor drainage creates a perfect environment for fungal growth.
- Thatch buildup: A thick layer of organic matter can trap moisture and harbor fungi.
- High nitrogen levels: Over-fertilizing can promote disease by encouraging weak, succulent growth susceptible to infection.
- Cool temperatures: Brown patch typically develops when nighttime temperatures are between 60-75°F.
Steps to Treat Brown Patch
Here are some practical steps you can take to address brown patch disease in your lawn:
- Reduce Excess Moisture
- Water early in the morning to allow grass blades to dry during the day.
- Ensure proper drainage by aerating compacted soil.
- Dethatch Your Lawn
- Remove excessive thatch to prevent moisture buildup and improve air circulation.
- Apply Targeted Fungicide
- Choose a fungicide labeled for brown patch and apply it according to the manufacturer’s instructions.
- Balance Fertilization
- Avoid high-nitrogen fertilizers during cooler months. Opt for balanced or slow-release formulas.
- Mow Correctly
- Keep mower blades sharp and mow at the recommended height for your grass type to reduce stress.
Need Help? Call Floridist
If diagnosing and treating brown patch feels overwhelming, let Floridist take the stress out of lawn care. Our science-backed, environmentally friendly methods are designed to provide lasting results. Call us today at 561-941-GROW for expert advice or a consultation.
With a little care and attention, your lawn can thrive even in South Florida’s challenging conditions. Take the first step toward a greener, healthier lawn today!