Gray snow mold, caused by the fungus Typhula incarnate can occur on many Front Range lawns. Snow mold occurs during periods of prolonged snow cover, but can also occur where leaves and other debris have accumulated on lawns during the fall and winter.
Battling Gray Snow Mold in Cold-weather Lawns
by Sue Booth, All About Lawns Columnist ...
Of these, the most common are: Cymbidium mosaic and tobacco mosaic (caused by viruses); anthracnose, black rot, fusarium wilt, rust, snow mold, southern blight (caused by fungi); and brown spot or leaf spot (caused by bacteria).
If an area of last year's grass is matted or looks "glued" together—a condition called "snow mold"—tease it apart with a gentle raking (be careful not to yank out the roots).
Leptosphaerulina Blight of Turf
Necrotic Ring Spot of Turf
Nightcrawlers
Powdery Mildew in the Home Lawn
Pythium Blight of Turf
Septoria Leaf Spot of Turf
Slime Molds
Snow Molds in Lawns
Stinkhorns ...
is late in the fall in those climates that see snow or temperatures below freezing for over 30 days. Mowing short this last mowing will reduce matting of the grass in the spring and decrease the chance of cool season fungal diseases called snow molds.
prevent sunlight from reaching the grass, which can kill grass or make it more susceptible to diseases. Compost excess leaves or use them as mulch. Mow your grass until it goes dormant; letting it grow too long in the fall may encourage snow mold, ...
 See also: Mold, Grass, Plant, Spring, Fertilize
  
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