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There are two types of snow mold that may affect turfgrass, gray
snow mold and pink snow mold. Gray snow mold is rarely a serious problem
in Indiana since it requires extended periods of snow cover to develop
(30 days for mild infections to begin and 90 days or more for serious
outbreaks). Unlike gray snow mold, pink snow mold does not require snow
cover but snow cover can promote disease outbreaks in certain situations.
Since pink snow mold is promoted by wet conditions, we can reduce the
possibility of disease by maintaining normal mowing heights into the
fall until growth has nearly stopped to avoid long grass that may become
matted and wet. It is important not to take this idea to its extreme
by scalping the lawn in late fall. Scalping will reduce the stored energy
for next year. Another good control practice is to avoid piling snow
on turf areas. In the spring the piled snow will keep the turf wet and
matted under the pile while temps are perfect for disease development.
--Glenn Hardebeck, Turfgrass Research Agronomist, Department of Agronomy,
Active pink snow mold on 1/2"
bentgrass in early spring
Plant and Pest Digital Library and Digitally Assisted Diagnosis, Purdue University, West Lafayette, Indiana.