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Fusarium Patch

Caused by: Microdochium nivale (Fr.) Samuels and I.C. Hallett

Susceptible Turfgrass
Bluegrass, fescue, bentgrass, couch and perennial ryegrass.

 

Symptoms

  • 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

 

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
Banner, Heritage have a label recommendation for Fusarium Patch in South Africa.

Parameter

Banner

Heritage

Mode of action

Systemic

Systemic

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

560g/ha
1120g/ha

560g/ha
1120g/ha

Water volume

500 to 1000 l/ha

800 to 1000l/ha