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Gray leaf spot (GLS) is a foliar fungal disease that affects grasses. In grasses other than maize it is caused by Pyricularia grisea , which only infects perennial ryegrass , tall fescue , and St. Augustine grass in places with warm and rainy climates.
For example, if St. Augustine grass is kept at 4 inches, it should be mowed before it reaches a height above 6 inches. Schiavon recommends mowing when it reaches 5.2 inches.
Panicum mosaic virus (PMV) is a positive-sense single-stranded RNA viral pathogen that infects plant species in the panicoid tribe of the grass family, Poaceae. [1] The pathogen was first identified in Kansas in 1953 and most commonly causes disease on select cultivars of turf grass, switchgrass, and millet.
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St. Augustine is a dark green grass with broad, flat blades. It spreads by aboveground stolons , commonly known as "runners", and forms a dense layer. The grass occurs on both sides of the Atlantic Ocean , [ 1 ] including much of the southeastern United States, Texas, [ 2 ] [ 3 ] Mexico, and Central and South America. [ 1 ]
Symptoms can overlap across causal agents, however differing signs and symptoms of certain pathogens can lead to the diagnosis of the type of leaf spot disease. Prolonged wet and humid conditions promote leaf spot disease and most pathogens are spread by wind, splashing rain or irrigation that carry the disease to other leaves. [2]
A simple example would be less frequent mowing. It has also been proven that the disease is most devastating in grass cut to a length of between 1/8 and 3/16 of an inch, but less so in grass over 1/4 of an inch in length or longer, which presents an additional argument for limiting mowing.
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related to: san augustine grass sod problems leaves disease damage removal