Common Diseases Affecting Zoysia Grass and Their Treatment

Zoysia grass is a popular warm-season turfgrass known for its dense growth, tolerance to heat, and ability to withstand heavy foot traffic. However, like any other plant, Zoysia grass is susceptible to various diseases that can impact its health and appearance. Understanding these common diseases and their treatment methods is crucial for maintaining a vibrant and lush Zoysia lawn.

1. Brown Patch

Brown patch is a fungal disease that primarily affects Zoysia grass during periods of high humidity and warm temperatures. It appears as circular patches of brown or tan grass, ranging from a few inches to several feet in diameter. The affected areas may have a dark brown ring around the perimeter.

Treatment: To treat brown patch, it is essential to improve air circulation and reduce excess moisture. Avoid overwatering and irrigate in the early morning to allow the grass to dry during the day. Fungicides specifically formulated for brown patch control can also be applied according to the manufacturer’s instructions.

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2. Large Patch

Large patch, also known as brown patch, is a fungal disease that primarily affects Zoysia grass during the cooler months of fall and spring. It appears as irregularly shaped patches of yellow or brown grass, ranging from a few inches to several feet in diameter. The affected areas may have a reddish-brown border.

Treatment: To treat large patch, it is crucial to improve drainage and reduce excessive thatch buildup. Avoid over-fertilization with nitrogen-rich fertilizers, as they can promote disease development. Fungicides labeled for large patch control can be applied in early spring or fall, following the manufacturer’s instructions.

3. Dollar Spot

Dollar spot is a fungal disease that affects Zoysia grass during periods of high humidity and when the grass is under stress. It appears as small, circular patches of straw-colored grass, typically about the size of a silver dollar. These patches may merge to form larger areas of damage.

Treatment: To treat dollar spot, it is important to improve soil drainage and reduce excess thatch. Avoid overwatering and irrigate in the early morning to allow the grass to dry during the day. Fungicides labeled for dollar spot control can be applied according to the manufacturer’s instructions.

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4. Rust

Rust is a fungal disease that primarily affects Zoysia grass during periods of high humidity and when the grass is under stress. It appears as yellow or orange powdery pustules on the grass blades, giving them a rusty appearance. Severe infestations can cause the grass to thin out and weaken.

Treatment: To treat rust, it is crucial to improve air circulation and reduce excess moisture. Avoid overwatering and irrigate in the early morning to allow the grass to dry during the day. Fungicides labeled for rust control can be applied according to the manufacturer’s instructions.

5. Zoysia Patch

Zoysia patch is a fungal disease specific to Zoysia grass. It appears as circular patches of straw-colored or tan grass, ranging from a few inches to several feet in diameter. The affected areas may have a reddish-brown border.

Treatment: To treat Zoysia patch, it is important to improve soil drainage and reduce excessive thatch buildup. Avoid over-fertilization with nitrogen-rich fertilizers, as they can promote disease development. Fungicides labeled for Zoysia patch control can be applied according to the manufacturer’s instructions.

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Regular maintenance practices such as proper mowing, adequate fertilization, and regular aeration can help prevent the occurrence of these diseases. However, if your Zoysia grass is affected, it is recommended to consult with a professional turfgrass specialist or local extension office for accurate diagnosis and appropriate treatment options.

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