What has caused brown patches in my lawn?
Posted by Dobies Staff on 28 August 2014 12:26 pm

Fusarium patch also known as snow mould is a common fungal disease causing brown patches on lawns. The disease usually occurs in autumn and during mild spells in winter or early spring although it can appear at any time of year. Alkaline soils and lush growth due to the use of high nitrogen fertilizers late in the season can make the lawn more prone to attack. The disease is often very noticeable once snow has melted which has given rise to the common name snow mould.

The first symptoms seen are small patches of yellowish, grass that dies and turns brown. The patches increase in size and can reach 30cm (12") in diameter. The patches can merge together to create large patches. In wet conditions a white or slightly pink mycelium can be seen especially at the edges of the patch.

To reduce the risk of attack ensure that the soil is well drained and aerated. High nitrogen fertilizers should not be applied in late summer or autumn, use one of the lawn fertilizers that has been formulated for autumn application. The fungal spores can be spread on shoes and lawn care equipment. Grass mowing’s should be destroyed and not composted. Spray with Bayer’s Lawn Disease Control should be applied as soon as the symptoms are seen.

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