Red Thread
Disease Background
Laetisaria fuciformis
Red thread is a fungal disease, which affects most cool season grasses, particularly perennial ryegrass (Lolium perenne) and red fescues (Festuca rubra spp.). Red thread is most prevalent during mild, humid conditions, which means it can be found active almost all year round in the UK. Symptoms are usually seen under conditions of low fertility, although an increase in activity is being recorded in turf which receives adequate nutrition. The severity of the infection will depend upon environmental influences and the susceptibility of the grass plant (stress factors or improved tolerance).
