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Your Red Thread Questions Answered by Our Experts


Red Thread is a very common fungal disease found in lawns across the UK.  If your lawn is suffering from Red Thread you may notice reddish/brown patches of decaying grass. Upon close inspection, very fine red needles can be seen protruding from the blades of grass.  Infected blades are often mixed with healthy blades giving the lawn a ragged appearance.

In severe cases, the grass looks scorched or yellowed in irregularly-shaped or circular patches from 5 to 50cm in diameter. The patches may be widely scattered or, if close together, may amalgamate into larger spots.

How did my lawn get Red Thread?

Red Thread is often caused by high humidity and low fertility. It is most common during summer months when humidity is very high. However, if we experience a mild autumn it can continue.

Can it spread from lawn to lawn?

Not usually, although if you are concerned about this, it may be a good idea to spray the mower blades with a hosepipe to remove any mycelium (fungus) from the blades.

What can GreenThumb do to remove Red Thread?

As low fertility is one of the causes it is advisable for our customers to receive their regular fertiliser treatments. However, if the problem persists due to humid conditions we can apply a fungicide treatment 2-3 weeks after the weed and feed is applied.

What to expect following an application of fungicide.

The lawn should overcome the disease within 2-3 weeks of application. It has been our experience that if the humid weather continues, Red Thread can reoccur. Cutting the lawn with a mower that is inefficient or does not have sharp blades could encourage Red Thread.

Did you know?

There are many other fungal diseases and disorders that are found on lawns throughout the UK. Examples of these could be Leaf spot, Fusarium, Snow Mould, Fairy Rings and Slime Mould.

If you believe that your lawn may be suffering from a lawn disease, please call your local GreenThumb branch.

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