Gray leaf spot

Gray leaf spot (GLS) is a foliar fungal disease that affects grasses. In grasses other than maize it is caused by Pyricularia grisea, which only infects perennial ryegrass, tall fescue, and St. Augustine grass in places with warm and rainy climates.

This article is about disease caused by P. grisea in a wide array of grasses. For Cercospora in maize/corn, see Corn grey leaf spot. For the similar disease in Oryza, see Magnaporthe grisea.
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