Pathogen:
Ophiosphaerella korrae
Host:
Annual Bluegrass, Kentucky Bluegrass, Fine Fescue, Rough Bluegrass
Environmental Requirements:
root infection occurs during cool wet weather, symptom expression during heat and drought stress
Stand Symptoms:
"frog-eyes" of wilted grass that will collapse and die out
Plant Symptoms:
purpling of the plant
Fungal Signs:
dark brown to black ectotrophic hyphae on the roots and crown
Environmental Modification:
water deeply and infrequently, lower pH, aerify, use a fall fertility program
Plant Resistance:
plant resistant varieties
