# Yellow Patches in My St. Augustine Grass
St. Augustinegrass (Stenotaphrum secumdatum) is a green to blue-green, warm-season native of the Mediterranean and the Gulf of Mexico regions. The grass adapts to a range of soil types and is tolerant of salt. A fungus causes yellow spots on St. Augustinegrass.
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Identification
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St. Augustinegrass is susceptible to the take-all root rot disease caused by Gaeumannomyces graminis var. graminis. The fungus is more prevalent in lawns excessively fertilized with high-nitrogen fertilizers. Excessive application of lime also makes St. Augustinegrass prone to disease.
Damage
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The disease starts with yellowing or chlorotic patches in grass. As disease spreads, the entire lawn takes on a yellow look. The grass begins thinning in irregular-to-circular patches ranging from 3 to 15 feet as roots die. Grass growing in full sun suffers the most damage. Rotting roots turn brittle and black.
Management
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Reduce nitrogen fertilizer applications in affected grass. Apply manganese sulfate to lawns. Chemical control options include the use of azoxystrobin, propiconazole or triademefon. Avoid using fungicides after a heavy rain.
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