Red Thread can develop within your lawn all year round, however is more commonly found during warm and wet spells of weather between spring and autumn. For example, a spell of high humidity during the summer combined with heavy rainfall will often see Red Thread developing.

Possible factors for outbreaks of Red Thread are the use of a blunt mower blade. Mowing with a blunt blade will tear the tips of the grass blades instead of achieving a clean cut, leaving a larger surface area for disease to attack. A lack of airflow is also an issue that can lead to Red Thread. Regular aeration and scarification will help increase airflow. Finally, but most importantly, low nutrients levels in the soil and poor soil quality can be one of the main reasons for Red Thread development.