Pathogen
Pythium spp.
Host
Annual Bluegrass, Kentucky Bluegrass, Creeping Bentgrass, Colonial Bentgrass, Velvet Bentgrass, Perennial Ryegrass, Tall Fescue, Fine Fescue, Redtop
Environmental Requirements
85-95 F daytime and 68F+ night time temperatures, high humidity, low soil moisture
Stand Symptoms
Circular reddish-brown patches
Plant Symptoms
Water soaked and slimy foliage
Fungal Signs
Whitish, cottony mycelium on affected turf when moisture is present
Environmental Modification
Improve drainage, avoid high levels of N fertility
Plant Resistance
Perennial Ryegrass most susceptible
