Causal Agent:Â Basidiomycetes in the order Agaricales are capable of causing Fairy Rings. The most common ones in Australia are;Â Lycoperdon; Marasmius; Tricholoma; however there are over 50 causal agents of this fungus.
Susceptible Turfgrasses:Â Occurs in all turfgrasses.
Fairy Ring symptoms vary with causal agents (fungal species).
Circular or arc shaped rings of darker or faster-growing turf appears in moist turf.
A concentric ring of dead grass may develop inside the circle of lush grass.
The size of the rings can vary from a few centimetres to indefinitely large.
Activity in the turf stops when the individual rings come into contact with each other.
Mushrooms or toadstools may be produced in the outer ring of lush growth.
As mycelium grows the soil becomes hydrophobic.
In a mature Fairy Ring, the outer ring of lush grass may be missing, leaving an outer ring of plant death and an inner ring of green turf.
Conditions Favouring Disease
Fairy Rings are more severe on light soils, which have low fertility and low moisture content.
Turf with a significant thatch layer.
Drier areas have significantly more Fairy Rings than higher rainfall areas.