Gray snow mold (Typhula incarnata)

This is a typical lawn disease. The fungus develops from late fall to spring at temperatures around 0-12 degrees. The cause of the infection is usually a weakening of the plant due to high stress, over-fertilization or compacted soil (waterlogging, wetness). The fungus usually disappears by itself and the affected areas heal by themselves at high temperatures.

The damage is similar to that of snow mould (Microdochium nivale), but the leaves of gray snow mould appear dry and papery. The grasses are stuck together. The patches are irregularly light brown-brown and up to over 50 cm in size. A light gray fungal network (mycelium) forms when there is sufficient moisture.

This fungal disease often occurs if the lawn has not been mowed before winter or if leaves or snow have been lying on the lawn for a long time.

The following can be done against the disease (mainly as a preventive measure):

• Remove leaves and grass clippings

• Remove snow from the lawn if the ground is not frozen

• Scarifying in spring (only 2-3 weeks after the first fertilization)

• Do not lime as long as the fungus is active

• Potassium-emphasized fertilization in autumn

• Mow regularly

• Ensure that the soil is permeable (scarifying, aerating, sanding)

If the fungus is still active, the affected areas can be lightly combed with a lawn rake. This loosens the adhesions and the affected area dries more quickly. The area also gets more air and light, which helps the lawn to regenerate more quickly.