Grey Leaf Spot Disease

Grey leaf spot disease is caused by the fungus Pyricularia grisesa. This particular fungus mainly affects St. Augustine grass and occurs during warm humid weather.

Infected leaves form olive green to brown water soaked dots. These spots enlarge to form elongate brown legions.

The moist Florida climate allows spores to produce with abundance. This gives the spots a velvet gray appearance.

Grey leaf spot disease is enhanced by the application of nitrogen fertilizers. St Augustine grass is easily susceptible during early stages of planting. The grass is more tolerant toward this disease once has become firmly established. To control Gray spot leaf disease try using fertilizers low in nitrogen or that contain a slow release nitrogen. Manage irrigation to prevent too much moisture on turf.

Contact a your local lawn care professionals for advice on treatment.

Treatment for Grey Leaf Spot Disease

Scotts Lawn Fungus Control, Bayer Advanced Fungus Control for Lawns