Scientific name: Sclerotinia homoeocarpa
The disease name of dollar spot is derived from the dead straw-colored spots about the size of a silver dollar. Many fungal classification experts now believe that the dollar spot organism is not from the genus Schlerotinia but debate continues as to its true nature. Some believe that there may in fact be more than one organism involved in the disease complex. One of the suggested new classifications is Colletotrichum floccosum. It occurs on bluegrasses, bentgrasses and fescues. 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 watersoaked and 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.
Solution
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