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Plants Affected By Brown Patch: 

Annual Ryegrass, Bermudagrass, Creeping Bentgrass, Fine Fescues, Kentucky Bluegrass, Perennial Ryegrass, Roughstalk Bluegrass, Tall Fescue, Zoysiagrass. 

Symptoms of Brown Patch:

Circular patches roughly 2 to 3 feet in diameter causing a light brown color. 

When moist, a dark purplish to grayish black ring ("smoke ring") of wilted and blighted grass blades may mark the blade. This ring appears because the leaves are dying so rapidly that they seem to be dying in unison. The smoke ring disappears as the grass dries. The smoke ring disappears as the grass dries. Usually, only the leaf blades are killed. After several mowings, new but thinned-out grass appears in the affected areas. Algae often invade diseased patches and dry to form a hard crust. On high-cut lawn grass, the roughly circular,irregular patches are light brown, matted down, and up to about 2 feet wide. The patches sometimes develop green centers and may resemble the"frogeyes" of summer patch and necrotic ring spot. Diseased patches of grass, however, often appear to be sunken. The appearance of the smoke ring borders is rare in this type of turf.

Life Cycle:

It is common in dense, highly fertilized turfgrass, during extended periods of hot, moist, overcast weather when the temperature at night is above 68 F and the leaf surfaces are covered with water.


Avoid excess nitrogen and improve air movement to the area by trimming trees and shrubs. Remove dew from the leaf surfaces in the early morning by mowing, brushing the grass with a long limber pole, or by dragging a mat, hose, or rope across the turf.
A Fungicide may be applied if the fungi is severe enough. I would caution that if you plan to apply fungicide to the affected area to follow the directions on the product step by step. Fungicides can be very expensive and only necessary if the fungi is severe enough. 


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Some of the information in this article and the picture was provided by The University of Illinois Extension.