What Type of Fungus or Disease Does My Lawn Have?

Understanding the various types of lawn fungi allows you to identify potential threats to your lawn. Recognizing the early symptoms and signs of specific diseases helps you take preventive measures to keep your lawn healthy. 

WHAT CAUSES LAWN FUNGUS?

Lawn fungus thrives in environments where moisture, warmth, and organic matter are present. Florida’s humid climate provides an ideal breeding ground for various types of fungi to develop. Overwatering, poor drainage, compacted soil, and excessive thatch buildup can create conditions conducive to fungal growth. Additionally, stress factors such as mowing too short, inadequate air circulation, and lack of proper nutrients can weaken grass, making it more susceptible to fungal infections.

WHAT DOES GRASS FUNGUS LOOK LIKE?

Identifying grass fungus early is crucial for effective treatment. Fungal infections manifest in different ways, presenting symptoms such as discolored patches, irregularly shaped spots, or a fuzzy, powdery coating on the grass blades. Keeping a close eye on your lawn’s appearance can help detect any signs of fungal infestation promptly.

Here in Florida, we commonly see the following types of lawn fungus or disease:

Dollar Spot

Dollar spot is characterized by small, circular or oval-shaped spots on the grass that are typically the size of a silver dollar, which is how it gets its name. These spots can be anywhere from a few inches to a foot or more in diameter. The affected grass in these spots often appears bleached or straw-colored. In addition to the characteristic circular spots, the grass in affected areas may appear to have a silver-white web-like mycelium during the early morning when dew is present. 

Brown Patch

Brown patch is a broad-spectrum disease that can impact many grass species, but it is more common in cool-season grasses like Kentucky bluegrass, perennial ryegrass, and fescue. Besides the browning and dark rings on grass, you may notice the grass blades in affected areas become slimy and water-soaked, especially during humid mornings. This can give the grass a greasy appearance.

Gray Leaf Spot

Gray leaf spot is named for the characteristic gray or silver lesions it creates on grass blades. These lesions can be elongated or irregular in shape and usually have a dark border. The disease often starts as small, water-soaked spots and can spread, covering large areas of the lawn. Gray leaf spot thrives in hot and humid conditions, typically during the summer and early fall.

Take-All Root Rot

This fungal disease is more likely to be problematic in areas with poor soil drainage. ake-all root rot is characterized by a gradual decline in the health and appearance of the affected grass. The symptoms typically start with small, irregular patches of yellowing or thinning grass, which can develop into larger, irregular areas of dead or dying turf. The roots of affected grass may appear black and rotted, hence the name.

Powdery Mildew

Powdery mildew is a common fungal disease that affects a wide range of plants, including your lawn. It gets its name from the characteristic white or gray, powdery, and dusty fungal growth that appears on the surfaces of grass blades. This growth often resembles a fine talcum powder. Unlike many other lawn diseases, powdery mildew prefers cool and dry conditions. 

HOW TO TREAT LAWN FUNGUS

Combatting lawn fungus requires a multi-faceted approach aimed at addressing both the symptoms and underlying causes. Begin by adjusting your lawn care practices to create less favorable conditions for fungal growth. Improve soil drainage, avoid overwatering, and maintain proper mowing height to promote healthy grass growth. Additionally, aerating the soil can enhance air circulation and reduce compaction.

Lawn fungus can be extremely destructive if left untreated, so if you notice the warning signs of this type of growth, it’s best to contact a professional before the fungus can spread. Lawn care experts have the knowledge and experience to accurately identify and treat the specific type of fungus affecting your lawn. Beyond treating the current fungal issue, a professional team also can provide guidance on preventive measures to reduce the risk of future fungal outbreaks.

Discover more top tips on how to maintain a healthy green lawn with our expert lawn care guides