Grease Spot
Grease Spot can effect all grasses in humid climates and can be recognized
by the slimy-brown patches that often have a white, cotton-like fungus
around it. Grease Spot gets its name for the "greasy" appearance
it makes while matting together and can appear in streaks across the
lawn.
Prevention
The best prevention for Grease Spot is to aerate often, water in the
morning hours only, remove excess thatch, reduce shade on lawn, and
cutback on the nitrogen levels during fertilization.
Treatment
The most common fungicide used on Grease Spot is metalaxyl.