Superficial Fairy Ring [Basidiomycetes spp]

Normally they have little effect on the on the grass sward, however in certain cases a yellowing ring maybe seen (see photo) caused by plant stress. Fruiting bodies such as toadstools and mushrooms are not associated with superficial fairy rings.

If a sample or a core is taken from the lawn, white mycellium accompanied with a strong musty smell may be present.

In some cases where a degree of thatch has accumulated there may be some undulations in the lawn (thatch collapse) hence the name thatch fungi.

The undulations or depressions in the lawn are caused by the fungi breaking down the organic matter in the soil.

There is not a recommended control measure as this disease is not harmful to grass, The only problem may be they can cause the grass to yellow as they restrict sunlight getting to the plant. Slime moulds can be simply brushed off the leaf or the grass with a brush or rake, however they will disappear once the weather changes to drier conditions.