Lawn Diseases

A lawn infected with a diseaseIf your lawn is looking a little under the weather it might be infected with lawn diseases. All lawns will suffer from lawn diseases eventually. It is not possible to totally protect lawns against lawn diseases, or fungal attack, because the pathogens that cause the infection are naturally found within the soil in which the plant grows. It is only when the environmental conditions are right that the pathogen attacks the plant causing an infection. The first visible sign of fungal infection will normally be the appearance of “straw” or white coloured patches within the lawn.

In order for a fungal disease to occur, three things are needed.  First, a pathogen such as bacteria or fungi which can exist within the soil or thatch layer, second a host for the disease i.e. the grass plant and third a favourable environment such as moist and  humid conditions.  Although it is not possible to totally protect your lawn against lawn diseases, you can minimise the risk by:

  • Mowing your lawn at the correct height and not too low. Mowing too low puts grass under stress and makes it susceptible to fungal attack by the pathogens within the soil.
  • Apply the correct amount of Nitrogen fertiliser throughout the year to match the growth requirements of the plant, too much can cause rapid growth resulting in thin cell walls, reducing the plants ability to withstand fungal attack.
  • Do not water to much or too little as this can cause stress, increasing the risk of fungal attack.
  • Scarify your lawn on a regular basis in order to maintain correct thatch levels.

The main fungal diseases you might encounter are Red Thread, Fusarium, Anthracnose, and Rust. Fungal disease can spread rapidly within an infected lawn.


If you see the initial signs of lawn diseases in your lawn and would like a professional opinion why not take advantage of the Lawnscience lawn review service. One of our fully trained lawn care professionals will be happy to arrange a free lawn review with you, during which they will identify the issue(s) and provide you with a fully costed solution for you to consider. To take advantage of this opportunity just contact us.