Use the photos and details in this guide to help identify the diseases afflicting your lawn.
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Dollar Spot
This disease is most active during periods of hot humid weather. It usually appears from late July through the end of August. Dollar Spot starts off as bright white circles resembling silver dollars left on the lawn during the heat of the day.
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Fusarium Blight
Fusarium Blight, also known as Necrotic Ring Spot, is a devastating soil bound disease that is most noticeable and damaging during the prolonged hot, dry conditions of summer.
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Leaf Spot
Leaf Spot is common and very destructive to Kentucky bluegrass. It is most damaging when the weather is cool and moist during the spring and fall.
![](../../Images/HomePageSubPages/CommonLawnDiseases/NecroticRingSpot_01.jpg)
Necrotic Ring Spot
Necrotic Ring Spot is a devastating soil bound disease that is most noticeable and damaging during the prolonged hot, dry conditions of summer.
![](../../Images/HomePageSubPages/CommonLawnDiseases/PowderyMildew_01.jpg)
Powdery Mildew
White, powdery mildew develops on grass blades especially in shaded areas or in areas with restricted air flow such as under trees or between homes.
![](../../Images/HomePageSubPages/CommonLawnDiseases/RedThread_01.jpg)
Red Thread
Red Thread usually occurs during cool wet weather, although it can appear at any time throughout the season. The grass turns light tan to pink in round patches.
![](../../Images/HomePageSubPages/CommonLawnDiseases/Rust_01.jpg)
Rust
Rust usually occurs in August and September. The rust colored spores of the fungus easily rubs off on shoes, fingers, clothing and lawn equipment. Lawns can take on a yellow/orange appearance and is more prevalent during hot and dry weather.
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Snow Mold
Snow Mold is a cold tolerant fungus that grows at or near freezing temperature. It usually occurs when snow stays on the ground for an extended period of time.
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