What color do St. Augustine grass leaves turn when affected by brown patch?

When St. Augustine grass is affected by brown patch disease, one of the primary symptoms is the yellowing of the leaves. This yellowing occurs because the disease disrupts the normal functioning of the grass, particularly affecting its ability to absorb nutrients and water effectively. As the disease progresses, the grass may display patches where the leaves turn yellow before eventually dying off, further indicating the impact of the fungal infection.

The yellowing is a characteristic sign that helps identify the presence of brown patch and distinguish it from other issues that may cause different coloration, such as nutrient deficiencies or drought stress. Recognizing these symptoms is essential for proper management and treatment of the grass to restore its health.