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Dollar Spot


Dollar Spot (Sclerotinia homoeocarpa), the disease name of dollar spotis derived from the dead straw-colored spots about the size of a silver dollar. It occurs on bluegrasses, bentgrasses, fescues, zoysia, and seashore paspalum. Under close mowing conditions the circular straw-colored spots are distinctly outlined; however, with higher cutting heights, the bleached turf spots are irregularly shaped. In the early morning, when dew is still on the grass, a white web-like growth of the fungus may be seen over the spot. If the spots coalesce, a more general blight may be observed. On individual grass blades the damaged tissues are first watersoakedand dark colored. As they dry, the lesions turn light tan to straw-colored with a reddish brown border. Dollar spot is most common in early summer, late summer and early fall in humid weather with warm days and cool nights. Dollar spot is less prominent in very hot weather