Lawn Diseases

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Snowmold:
Most common to Kentucky bluegrass and fescues in areas where snow falls and sits on the lawn for long periods of time. The best way to prevent snowmold is to aerate your lawn.
Brown Patch:
Most common to Bermuda, Kentucky Bluegrass, Centipede grass, Bent grass, St. Augustine, and ryegrasses in areas with high humidity and/or shade. Brown patch usually begins as a small spot and quickly spreads in a circular pattern.
Dollar Spot:
Most common to Kentucky bluegrass, Bent grass, and Bermuda in humid climates. Dollar spot gets its name from their small silver dollar-like shape, but can begin the size of a small grapefruit. It usually looks brown or straw-colored in appearance and may merge to form large patches. It is most common during warm, wet weather with heavy dews and in lawns with low levels of nitrogen.
Fairy Rings:
Grows in most grasses and are in the shape of circular rings filled with fast-growing, dark green grass. Around the edges of the circle, the grass usually turns brown and sometimes grows mushrooms. Fairy rings typically grow in soils that contain wood debris and/or old tree stumps.
Rust:
Appears to give leaf blades an orange color making it look like rust. Most commonly affects ryegrasses and Kentucky bluegrass. Flourishes in conditions of morning dew, shade, high soil compaction, and low-fertility. A good way to check your grass is by taking a paper towel and rubbing a few grass blades through it. If an orange color remains, then it is most likely rust.
Grease Spot:
Affects all grasses in humid climates and is noticed by the slimy brown patches that have a white, cotton like fungus around it. It mats together and appears in streaks across the lawn giving it a “greasy” appearance.
Red Thread:
Most common to fescues, ryegrasses, and Kentucky bluegrasses during times of moist and cool weather. The leaf blades have pinkish-red threads that form around them and bind them together. Eventually, it turns brown.
Powdery Milldew:
It looks like flour was sprinkled on the grass. The grass will eventually wither and die. Kentucky bluegrass and shad areas are the most susceptible.
Pythium Blight:
Wilted brown grass shaped irregularly throughout the lawn
Fusarium Blight:
Light green splotches that turn reddish brown and then die
Leafspot:
Brown to purple spots on blades that cause irregular dying areas of grass. Excess nitrogen fertility and excess thatch are the main causes