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