Signs of Dollar Spot include sunken, circular patches in your lawn measuring up to several inches in diameter. These white or brown patches may contain infected grass blades displaying small lesions that look like bands across the leaf blade. These bands turn from a yellow-green to straw color with a reddish border. The lesions on the grass blades may resemble an hourglass shape. Additionally, web-like mycelia (whitish lawn fungus) may appear early in the morning.
A Dollar Spot infection can occur only if all of the following conditions are present: 1. Pathogen: Sclerotinia homoeocarpa lawn fungus 2. Host: All warm- and cool-season grass types 3. Environment: High humidity climates with temperatures ranging from 59°-60°F and dry, low-nitrogen soils
Because you can't change your environment, the best way to control Dollar Spot is to create conditions that will foster a healthy lawn. Not only will this make your yard unfavorable for Dollar Spot growth, but it will also lower your risk of extensive damage should the lawn disease develop—plus you'll have the type of lawn you'll want to live on. For Dollar Spot control and lawn fungus treatment, TruGreen® recommends the following cultural control tips: • Use fertilizers with adequate levels of nitrogen • Mow grass at regular intervals • Aerate to reduce thatch levels • Decrease the amount of morning shade to decrease the amount of time dew is present • Plant disease-resistant types of grass