Place near a window and keep it moist. If the plug greens up within 3-5 days, the damage is superficial. If the plug fails to green up and resume growth, it means that there is some crown damage. This same technique can be used for winterkill. For home lawns with snow mould damage, it is best to rake the areas to encourage drying and to apply a light fertilizer application to speed recovery.
Voles are another one of the pests which usually cause nuisance damage during the winter.
Again, because of the long duration of snow cover there has been considerable damage from voles. To help the runways fill in, put down a light application of fertilizer in a week or two. One pest that is rearing its ugly head again this spring is the European chafer grub. Grubs are up near the soil surface now. With some of the warmer nights where there isn't frost in the ground, the raccoons and skunks have been foraging for the grubs.