What is brown patch disease?
Brown patch lawn disease, caused by the fungus Rhizoctonia solani, is a common fungal infection affecting grasses, particularly cool-season grasses like tall fescue, Kentucky bluegrass, and perennial ryegrass. It’s prevalent in humid and warm conditions, often appearing during the summer months.
Characterized by circular or irregularly shaped patches of brown, blighted grass, brown patch disease typically starts as small spots that expand outward, sometimes reaching several feet in diameter. The affected grass blades have distinct lesions at their bases and may appear water-soaked or slimy in the early morning.
Key factors contributing to brown patch disease include:
- Weather Conditions: Warm and humid weather, especially combined with excessive moisture or rainfall, creates an ideal environment for the fungus to thrive.
- Excessive Moisture: Overwatering, poor drainage, or watering at inappropriate times (like evenings) can contribute to fungal growth.
- Compacted Soil: Compacted soil limits air circulation and root development, making grass more susceptible to disease.
Preventing and treating brown patch disease
To treat brown patch disease, you can apply a fungicide designed for brown patch control throughout your lawn. There are also several measures you can take to prevent the fungus from returning or spreading, such as limiting the use of nitrogen fertilizers, improving soil drainage, and improving air circulation.
The University of Missouri Extension recommends maintaining healthy turf as the best way to manage this disease. Avoid over-fertilizing your lawn and use a slow-release source of nitrogen only when the disease is dormant. Keep watering to a minimum, preferably only in the early-morning hours. Aerify your lawn to reduce thatch, maintain proper soil pH, and mow at the proper height with sharp mower blades.
If brown patch disease persists or worsens despite preventive measures, we encourage you to contact Creekside Turf Management to speak with a lawn care professional. We can provide specific guidance on managing and treating the issue. We serve Cedar Rapids, Marion and surrounding communities.
