Lawn Problem: Fusarium/Snow Mould

How do I identify fusarium?

Fusarium will occur in round patches from 5 to 30cm and can merge to form much larger areas. The grass will start to yellow, then brown and it turns to a kind of mush. The fusarium fungus will kill the whole grass plant, so severe cases can be devastating to lawns. You may see a white, cotton like growth within the patch. This fungus is likely to occur from autumn through to spring and will often occur when very foggy conditions prevail.

What is Fusarium/Snow mould?

Fusarium is an air and water bourn fungus. It can lay dormant under snow coverage but upon the snow melting can rapidly grow, hence snow mould. It is less common than Red Thread which could be climatic as we are experiencing warmer winters.

How do I cure Fusarium/Snow mould?

Fusarium is a fungus and can be treated with a fungicide by a professional. This may prevent further damage but will not help already affected areas where the grass has been killed. If conditions last longer than four weeks the condition can continue, deeming the original fungicide useless.

At LawnsOne we will not use fungicides as they kill beneficial soil fungi, instead we aim to keep the soil and plant in a healthy state, so it is more resistant to disease.

Once conditions and the disease have subsided you may have areas of dead grass remaining. Rake these in spring, seed them and dress a little soil over them to form a repair.

Key points to remember

  • Keeping the soil and grass plant in optimum health is the best form of defence. Harden with an iron solution.
  • Seed any damaged areas after the attack has stopped.
  • Using fungicide will kill beneficial soil-borne fungi too.

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