Lawn Treatment

Brown Spots on your Lawn – has your lawn Fusarium Patches?

Brown Spots

Brown Spots – How to recognise Fusarium Patches

One of the key reasons for brown spots on your lawn may well be Fusarium disease which is typically seen during the Autumn and Winter months. The Fusarium patch is caused by the fungus  Microdochium Nivale.


Fusarium Patch disease thins out your lawn. It looks like a white mould on top of the patchy area. It’s easiest to see the mould in the morning.  You can double check this by leaving a cover over the patch overnight. If the mould is there in the morning, then you know you have fusarium disease.


Brown Spots
Brown spots on the lawn – Fusarium Patches


Brown Spots – How Does Fusarium Affect Your Lawn?

The mould is often brought on by the weather conditions at the end of year. During the Autumn/ Winter there is less light and more cloud cover.  There may be mist in the morning but the overnight temperatures are higher.

These conditions help the naturally occurring fungal spores in the grass soil to become active.  And this spore activity creates bare yellow brown patches and the mould to appear.



How to Fix the Fusarium Brown Spots

Fusarium can fix itself when the light level increases and the temperatures get colder.  In Spring when the weather gets warmer and light returns those yellow brown lawn patches should disappear.


But we have some advice for you:

  • Assist the natural conditions that may revert the brown spots. Use the appropriate mowing height, lawn feed and reseeding parts of your lawn to return the green colour and fill in the thinned out patchy areas.
  • When grass is very low cut it is often more susceptible to the development of the mould. So be careful in these months not to cut too low. Remember we are not in Summer now so the lawn mower blade should be raised.
  • The spores can spread across your lawn from the patches by disturbance from feet walking across the area or dragging equipment across it. So keep the area with yellow brown lawn patches free of traffic.


And of course do these good practice basics –  feed the lawn, aerate and scarify

  • Aerate your lawn – good airing circulation and drainage will help the dew or rainfall to clear away
  • Get more light to your lawn and again improve air circulation by cutting back overhanging trees and shrubs
  • Use an appropriate Autumn and Winter lawn feed. Greenfeet creates its own feeds and can advise on the appropriate mix.  Too much nitrogen in fertiliser can increase chances of Fusarium
  • Don’t unwittingly spread the spores through treading or dragging across the patches
  • Re-seed the bald patches
  • Contact Greenfeet and get a lawn assessment


Brown Spots on Your Lawn – When to Fix Them

You are most likely to see the Fusarium patches during Autumn and Winter.  Keep an eye out for it after snow has melted – we may have a cold Winter this year in Ireland. It’s from its appearance after snow that Fusarium gets its common name of ‘snow mould’.


Give Greenfeet a call and get a free evaluation of your lawn. Our experts will arrange a time suitable to you and will identify any issues for your lawn and explain what’s needed to fix it for Autumn/ Winter.

So get your lawn sorted this Autumn and Winter.



Get your FREE lawn evaluation of your lawn’s needs by Greenfeet Lawn Care.  Our consultants will arrange to visit and assess your lawn needs.

Call 1890 252 778 or complete the form above. We look forward to helping you.

Brown Spots on your lawn