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Brown Patch Disease - St Augustine Grass

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Uploaded on Dec 7, 2010

Brown Patch Lawn Disease (fungus - Rhizoctonia solani): The name, brown patch, is not very descriptive of the varied symptom expression caused by Brown Patch (Rhizoctonia spp.) on turf grass. Symptoms differ on cool- and warm-season grasses and vary depending on environmental conditions and cultural practices.
Turf grass affected by brown patch generally will exhibit circular or irregular patches of light brown, thinned grass. On cool-season grasses (bent, rye and fescue) during periods of warm, humid weather, a darkened border or smoke ring may develop at the outer margin of the patches. The smoke-ring symptom is not reliable for diagnosis.
Symptoms on warm-season grasses such as bermuda grass or St. Augustine grass include circular to irregular patches of blighted turf. Patches up to several yards in diameter commonly develop in the fall, winter and spring when these grasses are approaching or emerging from dormancy, evening temperatures are below 68 oF, and rainfall usually increases. Active infections are noticeable by yellow leaves at the edges of patches. Leaf sheaths become rotted, and a gentle tug on the leaf blade easily separates the leaf from the runner. Brown patch usually does not discolor roots. Disease develops most rapidly when air temperatures are between 75 and 85 oF and wet conditions are present and generally subsides when air temperatures rise above 90 oF.
Management: Water only as needed and early in the day to remove dew and allow the grass to dry quickly. Avoid over fertilization in spring and fall. Improve the turf grass root system with good drainage and aeration to reduce damage caused by brown patch. Fungicides are most effective when used on a preventive basis.

Learn more here: http://realgreenlawn.com/austin_texas...

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