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Dollar spot
Dollar spot is caused by the fungal pathogen ''Sclerotinia homoeocarpa'', in the Sclerotiniaceae family. The pathogen blights leaf tissues but does not affect turf grass roots or crowns. The disease is a common concern on golf course turf, but is rare in sports turf and professional landscapes. Disease symptoms commonly result in poor turf quality and appearance.〔http://www.extension.purdue.edu/extmedia/BP/BP-105-W.pdf〕 The disease occurs from early spring through late fall, but is most active under conditions of high humidity and warm daytime temperatures and cool nights in the spring, early summer and fall. The disease infects by producing a mycelium, which can be spread mechanically from one area to another.〔http://aggiehorticulture.tamu.edu/archives/parsons/turf/publications/Dollarspot.html〕
==Hosts==
Dollar spot is most commonly found on closely mowed turfgrasses. The pathogen infects most cool and warm-season grasses throughout the world, including creeping bentgrass (''Agrostis stolonifera''), annual bluegrass (''Poa annua''), Kentucky bluegrass (''Poa pratensis''), perennial ryegrass (''Lolium perenne''), hybrid bermudagrasses (''Cynodon dactylon x tranvaalensis''), seashore paspalum (''Paspalum vaginatum''), and zoysiagrass (''Zoysia spp.'')〔
抄文引用元・出典: フリー百科事典『 ウィキペディア（Wikipedia）』
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