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Curvularia Leaf Spot

Causal Agent: Curvularia spp.

Curvularia Leaf Spot

 

Susceptible Turfgrass
Wintergrass, Kentucky Bluegrass, Bentgrass, Fescue, Couch.

 

Symptoms

  • Individual leaves initially show yellow and green dapple patterns that extend downwards from the leaf tipInfected leaves turn brown, then grey as they shrivel and die.

  • Irregular shaped patches of thinned turn appear, often coalescing to affect larger areas.

  • Stolons and leaf sheaths may also rot.

 

Conditions favouring disease

  • Curvularia Leaf Spot occurs in areas that experience prolonged leaf wetness for several consecutive days.

  • Curvularia spp. Occurs at temperatures, 25C to 35C.

  • Soil compaction and excessive levels of nitrogen and thatch.

General Comments

  • Curvularia is mostly secondary disease after primary pathogens such as Spring Dead Spot and Helminthosporium, have infected turfgrass.

  • Physiological changes in the turfgrass plant can increase susceptibility to Curvalaria when the light intensity is low or when the mowing height is lower than recommended for the specific situation.

  • Sometimes called "Fading Out".

 

Integrated Turf Management

  • Maintain balanced fertility.

  • Increase the height of cut.

  • Avoid nitrogen applications in the spring when the disease is active.

  • Avoid over watering.

  • Improve the drainage of the turf.

  • Reduce thatch accumulation.

Fungicidal Control
Daconil WeatherStik has label recommendation for control of Curvularia Leaf Spot in South Africa.