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
