It appears as small freckles across the lawn about the size of a 50-cent piece.
Originally found in Bentgrass (USA) where it formed spots the size of silver dollars, consequently the name “dollar spot”.
Infected areas 10 cm or larger may run together, causing great patches of dollar spot over the turf area. Irregular patches to 3 metres wide
Dollar spot fungi can be spread by mowers, feet, hoses, travelling sprinklers and other maintenance equipment.
May be active from late spring to late autumn.
Most problems develop when temperatures are tolerably warm and change rapidly, as with warm days and cool nights.
Heavy layers of a thatch can encourage Dollar Spot because water, air and nutrients cannot penetrate to the underlying soil and grass roots. This results in shallow and poorly developed roots that are highly susceptible to drought stress.