Pink Patch

Limonomyces roseipellis

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  • Pink patch, formerly thought to be a form of red thread and caused by the fungus Limonomyces roseipellis, is a minor disease of frequently mowed grass. Pink patch is much more severe on either unmowed or infrequently mowed grasses that are grown under low nitrogen fertilization than it is on highly maintained turfgrasses. Although patches generally remain green, diseased turf may have a tannish cast. Affected areas in above-ground portions of coarse-textured turfgrass are irregularly shaped blotches, but distinct pinkish patches, two to six inches across, occur in creeping bentgrass. The disease occurs primarily in spring and autumn during prolonged periods of heavy dews, light rains and fog, although it may occur during the summer months between 60° and 70°F. Small, irregularly shaped areas of turf become covered with a pink to reddish film of mycelium that tends to form first along the leaf margins. Later, the entire width of the leaf blade is covered. Only leaves and sheaths are infected, and diseased leaves die from the tip downward.

 

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