Gray Leaf Spot Fungus

One of the common problems we encounter in early summer on St. Augustinegrass is a leaf spot disease called Gray Leaf Spot. Gray leaf spot develops rapidly with abundant moisture and warm temperatures on St. Augustine grass. It is especially troublesome in shaded areas that remain damp for prolonged periods of time, or in low-lying spots, or where water runoff flows regularly. Under these conditions, the disease can cause serious thinning of the turf.

Spots first appear as tiny brown to ash- colored spots with purple to brown margins that enlarge and become elongated or diamond-shaped. Sections of the leaf blade will also turn yellow. In severe cases, lesions develop on stems and spikes and the leaves wither and die. Grass may have a burned or scorched appearance resulting from death or spotting of the leaf blades.

To help prevent Gray Leaf Spot:

• Water lawn early in the morning, and only when supplemental water is needed.
• Avoid watering in the evening- this keeps the leaf surface wet for long periods.
• Catch and remove grass clippings where gray leaf spot is a problem.

If you would like to know more about this and other services please request a free estimate.