Rapid Blight

Labyrinthula terrestris

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  • Rapid blight is a new disease of cool-season turfgrass. Early symptoms of this disease include patches of turf that appear water-soaked, slightly sunken and darker than healthy turf. Affected turf yellows and dies. Small patches several inches across may enlarge rapidly to over a foot in diameter, coalesce and result in larger areas of dead turf. Mowing and foot traffic can increase disease incidence rapidly. In a few cases, entire plantings of cool-season turf seedlings have been lost. The disease has been consistently associated with sites with poor-quality irrigation water: high salinity and sodicity and high bicarbonate concentrations.


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