Pathogen
Typhula incarnata
Typhula ishikariensis
Host
Annual Bluegrass, Kentucky Bluegrass, Colonial Bentgrass, Velvet Bentgrass, Creeping Bentgrass, Perennial Ryegrass, Fine Fescue, Tall Fescue
Environmental Requirements
30-40 F, high moisture, under snow cover, lush foliar growth
Stand Symptoms
Circular grayish or straw colored blighted areas, after snow melt grayish white mycelium can be seen on the outer margins
Plant Symptoms
Plants are matted
Fungal Signs
T. incarnata – large rust colored sclerotia
T. ishikariensis– small black sclerotia
Environmental Modification
Avoid lush growth going into winter, mow grass until growth has stopped
Plant Resistance
Kentucky Bluegrass and Fine Fescues are the least susceptible
