Leaf Spot

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Leaf spot diseases are very common and can occur when dry weather alternates with cloudy, wet periods and during cool to moderate temperatures. The turf is also vulnerable when it becomes stressed, usually resulting from excessive water applications or when the grass is mown short and is in shade. Dormant and active pathogens are able to survive for long periods among infected debris found in the thatch layers of the turf.
 
The following conditions will favour and provide the right environment for disease attack:
  • Nutrient deficiencies
  • Cool / warm temperatures
  • Moist / wet surfaces
  • Over watering
  • Close mowing
  • Shade
  • Poor air movement
  • Susceptible grass species
  • High soil pH

Symptoms of Leaf Spot
The symptoms will vary depending on the extent and severity of the attack. The first symptoms are seen as small leaf spots, having purple and black specks seen on leaf blades.
 

Controlling Leaf Spot
Keeping the sward healthy and reducing the conditions that favour this disease will be the first priority to keep this disease from your turf. The following actions should help you achieve this:
  • Aeration to help keep the surface free draining.
  • Prevent moist conditions remaining on the surface by brushing
  • Apply a balanced fertiliser
  • Scarify to control thatch layers
  • Remove clippings
  • Check mowing heights and keep blades sharp
  • Treat with approved fungicides only as a last resort and in conjunction with the other control methods above.
  • Reduce shade if possible