1st Class Pro Lawn - Lawn and Turf Diseases

Types of Lawn Diseases
Image	Type	Season	Description
	Brown Patch	Mid to Late Summer	Large, irregular circular areas, up to several feet in diameter, occur throughout the lawn. The patches usually have a brownish to gray discoloration with a water-soaked appearance around the edges. Normally, only the leaves and stems are attacked.
	Dollar Spot	Spring thru Fall	Dollar spot symptoms vary depending primarily on turfgrass species, mowing height and nutrition level. Overall appearance of dollar spot on closely mowed bentgrass golf greens differs from that observed on taller Kentucky bluegrass, fine fescue and perennial ryegrass turfs.
	Fusarium Patch	Fall to Spring	Circular patches, 1 to 8 inches in diameter; tiny white or pink masses are sometimes seen on dead leaves. Fungal threads, also white or pink, become visible in early morning. Blades of grass are light tan and stick together. Small, white or pinkish gel-like spore masses are occasionally seen on dead leaves. This disease is called pink snow mold if it develops under snow or at the margins of melting snowbanks.
	Leaf Spot	Spring to Fall	The most obvious symptom of this disease is elongated circular spots on the grass blades. These spots have a brown or straw-colored center with black to purplish borders.
	Necrotic Ring Spot	Spring to Fall	"Frog-eye" patterns occur in the lawn; these are small circles of dead grass with a tuft of green grass surrounding and enclosing them. Infected leaves turn reddish-purple.
	Powdery Mildew	Early Summer to Fall	First symptoms are light patches of dusty, white to light gray growth on grass blades, especially during cool, rainy weather. Lowest leaves may become completely covered. Although generally not too serious a problem, it can become severe if not controlled. Heavily afflicted areas look as though they've been covered with lime or four or sprayed with a coat of white paint.
	Pythium Blight	Summer	The first indication of this disease is the occurrence of irregular patches a few inches in diameter. In those areas, the grass blades appear water-soaked, soft and slimy. The blades soon sither and fade to light brown or straw color, sometimes reddish brown, particularly if the weather is sunny and windy. Then the patches join to form large damaged areas, often several feet in diameter. In the early morning, a white, cottony fungus can be seen on the blades of diseased plants.
	Red Thread	Fall	Small spots that appear water-soaked enlarge rapidly to cover a large part of the leaf. As the spots dry, the leaves fade to a light brown or tan. Pink webs bind the grass blades together. Later, the fungus forms thin, red-to-pink, finger-like structures at the tips of grass leaves, which gives the lawn a reddish cast.
	Rust	Midsummer to Fall	The lawn takes on a rust-colored cast, especially noticeable from a distance. Dust-like spores, the main symptom of this disease, form in circular or elongated groups on grass blades. Anything moving through a severely infested area will be covered by the spores, and may spread the disease.