Other common names:
Dollar spot is a foliar disease. It occurs as small, circular spots or lesions that can enlarge and coalesce to form large circular or irregular areas of dead turf. The dead leaf tissue is usually straw-coloured. The disease is favoured by low nitrogen levels in the soil and long periods of leaf wetness. Fine, white, webbed mycelium can be observed across the leaves in the presence of high canopy moisture (rainfall, irrigation or dew). Fungal growth occurs above 16°C is optimum between 21-27°C. The disease is normally found on established turf and has low economic significance. Dollar Spot has a worldwide distribution, and also affects cool-season turfgrasses. Content from Loch and Bransgrove (no date).
Molecular analysis by Rutgers, Ohio State and NC State Universities has shown that dollar spot pathogen is not a true Sclerotinia and that it is unlike any other fungal genus. They note that there are 4 distinct groups of fungi that cause dollar spot worldwide and the new proposed 4 species names (as of 7 Feb 2018) are:
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250 GT Turf Fungicide
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Dedicate Turf and Ornamental Fungicide
Posterity Turf Fungicide
Preventative and Curative Turf Fungicide