Brown patch, or Rhizoctonia Blight, is a lawn disease that becomes active in hot and humid weather. These somewhat circular patches can range from several inches in diameter to 3 feet, leaving behind a circle of brown grass. In older patches with this disease, the center of the grass will sometimes grow back, leaving a frog-eye appearance.
These symptoms can appear overnight when environmental conditions are right. On the outer edges of the patch, you might see a “smoke ring,” a blue-grayish ring that shows the reaction of the grass as it progresses outward to new grass. This ring usually looks water-soaked. This grass fungus also produces mycelium, a substance that looks like a cobweb which will show up in early mornings when dew is present.
Your grass will eventually grow out of this disease as long as it only affects the blade. If it spreads to the crown, however, it will die. Younger lawns stand a significantly smaller chance of surviving this disease.
Factors that favor lawn diseases:
- Overnight temps stay above 70
- Daytime temps stay above 85
- Humidity greater than 86%
- Abundant rainfall
- Excessive irrigation
- Soil stays damp 10+ hours/day
- Over-fertilized lawns
- Quick release, water-soluble fertilizers (i.e. ammonium nitrate)
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Rainy Days Irrigation, Inc. | 115 Sigma Dr. | Garner, NC | (919) 779-9285
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