Red thread has been festering in turfgrass for some weeks now, but really blew up over the last few days. As long as there is plenty of moisture – light rain, heavy fogs, dew – and optimal temperatures (60ºF to- 75ºF) – the fungus that causes red thread, Laetisaria fuciformis, will tear up susceptible grasses.
Pseudosclerotia (red threads) of Isaria fuciformis are clearly evident on red thread infected fine fescue. Photo: Sabrina Tirpak, Rutgers PDL
