Pathogen:
Microdochium nivale
Host:
Annual Bluegrass, Kentucky Bluegrass, Rough Bluegrass, Colonial Bentgrass, Velvet Bentgrass, Creeping Bentgrass, Perennial Ryegrass, Fine Fescue, Tall Fescue
Environmental Requirements:
32-45 F, high moisture, under snow cover or cold rain, lush foliar growth
Stand Symptoms:
without snow cover: circular reddish-brown patches, with snow cover: circular bleached and matted patches
Plant Symptoms:
plants are matted and may appear pink from spores
Fungal Signs:
immediately following snow melt, pink mycelium at margins of the patch
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
