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In spring and fall, if you notice small, oblong, black lesions with a tan center on your grass, it is probably Leaf Spot. As the disease progresses, the lesions run together which causes the grass blades to wither into a lifeless, dull brown color.
During hot summer weather, the lesions are not as obvious, and at that time the disease attacks the crown and roots of the plant, thinning and destroying large areas of turf.
Leaf Spot on your grass should be treated with a chemical designed to control and kill lawn fungus.