Leaf Smut
Usually occurs in cool weather (50 — 60) and usually effects bluegrass,
sometimes fine fescue and perennial rye. Infected plants die when weather
heats up. Excess water and fertilization encourages growth.
Prevention
Difficult to control. Treat with a systemic fungicide in October or
early March. Water thoroughly after application.
Treatment
Avoid overwatering, reduce thatch.