Susceptible Turfgrasses: All turfgrass species, predominantly cool season grasses.
Bentgrass – Pennlinks, A1 & A4, Providence, L-93, Penn G2 have shown superior tolerance (Hurley, 1999).
Most susceptible – Crenshaw, SR1020.
Small, sunken, circular patches 1.5 to 5cm in diameter.
The patches turn from brown to a straw colour and may eventually coalesce, into larger irregularly shaped areas.
In the presence of dew, mycelium may be seen as a fine white cottony thread.
Infected leaves may display small lesions that turn from yellow-green to straw colour with a reddish-brown border.
Lesions can extend the full width of the leaf.
Multiple lesions may occur on a single leaf blade.
Conditions Favouring Disease
Temperature ranges of 16°C to 28°C and continuous high humidity above 85%.
Warm humid weather with cool nights that produce heavy dews.
When the micro-climate temperature reaches 16°C the fungus resumes growth.