Gray Leaf Spot of St. Augustinegrass.
Photograph courtesy Lane P. TredwayUniversity of Georgia, Department of Plant PathologyMiller Plant Sciences Building, Athens, GA 30602
Host: St. Augustinegrass (Stenotaphrum secundatum)Disease name: Gray Leaf SpotPathogen name: Pyricularia grisea (teleomorph Magnaporthe grisea)
Gray leaf spot is a persistent problem in the maintenance of St. Augustinegrass for lawns, landscapes, and sod production. When managed properly, St. Augustinegrass rarely sustains serious damage from gray leaf spot activity. However, during extended periods of warm and humid weather, fungicide applications may be required to prevent significant reductions in aesthetic quality. Gray leaf spot has recently become a problem in cool-season grasses, such as tall fescue and perennial ryegrass. Widespread losses of perennial ryegrass turf have been reported in the Northeast and Mid-Atlantic U.S. since 1995. Gray leaf spot of tall fescue has been observed in the Southeastern U.S., where significant damage can occur during the late summer and early fall.
APS publication number: IW000019
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