16 17 See our website for more information See our website for more information Leaf Spot Cultural: Maintain optimum fertiliser rate, remove clippings, remove excessive thatch, remove surface moisture, improve air movement over turf surface. Chemical: Effective fungicides are available, preventative applications around high pressure periods provides optimum results. Management Symptoms Depends on grass species. In general, a yellowing or paling of leaves with spots or lesions developing. Susceptible grass species All grass species susceptible. Most common disease in Perennial ryegrass football pitches. Time of year Growing season. Climatic conditions Warm weather, moist grass leaves, overcast. Turf conditions Leaf wetness, poor air movement due to shading, excessive nitrogen, excessive thatch, general turf stress. Brown Patch Cultural: Ensure adequate drainage, reduce surface moisture, control thatch layer, encourage morning sunlight penetration, encourage air movement over the surface, appropriate use of fertiliser as lush grass is more susceptible. Chemical: Effective fungicides are available. Timing of application dictates optimal performance. Preventative use during periods of high disease pressure provides optimal control. Management Symptoms Tan to dark patches. In humid conditions a brown/grey ‘smoke ring may develop around the edge. Susceptible grass species All grass species susceptible. Time of year Summer. Climatic conditions Warm, humid. Turf conditions Water soaked grass, poor drainage.
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