Winter Fusarium

Winter Fusarium (Microdochium nivale) is also known ‘microdochium patch’. The same fungus causes a disease called ‘pink snow mould’ in the US.

Conditions that favour this disease


  • Wet conditions during maximum daytime temperatures of 7–20°C.
  • Shaded or poorly-drained locations.
  • Excessive nitrogen fertility conditions.

Management to discourage the incidence of Winter Fusarium

  • Good soil aeration and water drainage,
  • Reducing shade
  • Monitor the evapotranspiration needs of turfgrass to schedule irrigations.
  • Avoid excess nitrogen fertilization, especially in fall
  • Maintain the soil pH between 6.5 and 6.7.
  • High levels of potassium tend to suppress the disease.

If Winter Fusarium has been a problem in previous years, apply a fungicide in autumn before symptoms develop.

Treatment options

Apply fungicides before the advent of cool, wet weather (late autumn to early spring), and continue applications until the environmental conditions no longer favour pathogen development.

Registered for control of Winter Fusarium Active ingredient Active ingredient concentration Mode of action
Interface Turf Fungicide* IprodioneTrifloxystrobin 256g/L, 16g/L 2, 11
Dedicate Turf Fungicide TebucanozoleTrifloxystrobin 200g/L, 100g/L 3, 11
Chipco GT Fungicide Iprodione 240g/L 2
Bayfidan Turf Fungicide Triadimenol 250g/L 3

* Contains StressGard® Technology

Preventative Curative Eradicant
Spore Germination
Spores are present but they are not visible to the naked eye
Very first signs of Fusarium development
Visible to the naked eye
Early Fusarium spreading
Fusarium spreading with mycelial growth
Fully developed Fusarium

Send an e-mail or photograph to if you have any experiences of turf with either of these symptoms.




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