Microdochium Patch

Microdochium nivale (Fr.) Samuels and I.C. Hallett

Turf Disease

Susceptible turfgrass: Bluegrass, fescue, bentgrass, couch and perennial ryegrass.

South Africa Golf Turf Care Treating Microdochium Patch


  • Early water soaked circular spots (less than 5 cm).
  • Colour changes orange brown - reddish brown - light grey or tan (no more than 20cm).
  • Closer inspection reveals water soaked dark margins in active spots.
  • May be confused with Pythium blight lesions.
  • Streaks easily - mower / run-off water.
  • Infection will rarely progress to crown or kill plants completely.
  • Humid, cool conditions may see the development of white mycelial growth and ultimately pinkish sporodochia.

Microdochium Patch

Conditions favouring disease

  • 1 - 15ºC with free leaf moisture.
  • Disease development speeded up dramatically after initial infection.
  • Low humidity & higher temperatures slows development down.
  • Most severe on poor drainage areas - higher mowed turf which becomes matted down.
  • Disease severity enhanced by deficiencies in potassium and elevated nitrogen levels.

Integrated turf management

  • Maintain adequate fertility levels especially potassium.
  • Increased N in spring & autumn may aggravate.
  • Counter possible factors contributing to slow turf growth.
  • Counter possible factors contributing to bad drainage.

Fungicidal control

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Mode of action



Optimum timing

Begin treatment in May (late autumn / early winter) before disease is present.

Treatment throughout the winter (May - August) for temperate regions.

Begin application when conditions are favourable for infection prior to disease symptom development.

Dose rate



Water volume

500 to 1000 l/ha

800 to 1000l/ha