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Necrotic ring spot is a common disease of turf caused by soil borne fungi (Ophiosphaerella korrae) that mainly infects roots (4). It is an important disease as it destroys the appearance of turfgrasses on park, playing fields and golf courses .
Ophiosphaerella korrae, Ophiosphaerella narmari, and Ophiosphaerella herpotricha affect bermudagrass (Cynodon species), while the latter fungus also causes dead spot in buffalo grass (Bouteloua dactyloides). Ophiosphaerella korrae is a cause of necrotic ring spot in creeping red fescue (Festuca rubra). [3]
When an area of the creeping bentgrass is affected, large dead spots in the turf are seen. [2] These symptoms are most often observed in the summer months when soil and surface temperatures are high. Because Pythium volutum is a root rotting pathogen, the ability of the creeping bentgrass to intake water is inhibited. When soil and surface ...
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Dollar spot is the most common turfgrass disease in North America, with the exception of the Pacific Northwestern United States and Western Canada. [13] When left untreated, dollar spot can reach 90% disease severity and more money is spent per year to manage dollar spot than any other fungal disease.
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