snow mold

noun

Plant Pathology.

a disease of cereals and other grasses, characterized by a dense, cottony growth that covers the affected parts as the snow melts in the spring, caused by any of several fungi of the genera Calonectria, Fusarium, Pythium, and Typhula.
any fungus causing this disease.

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Start by dethatching the lawn, which will reverse the effects of snow mold.

Ugly gray circles on the lawn is a sign of snow mold.

Snow mold is more of a problem in colder areas like Eastern Washington.

The conditions also mean more snow mold.

Snow mold damage to winter wheat and triticale that east Oregon farmer Bill Buhrig worried about several weeks ago has mostly vanished.