Receding snow reveals lawn woes

Stockpiled snow has finally surrendered to salt and sun. Unfortunately, its retreating has exposed my shaggy dog of a lawn. If only I could send it out for a wash and a blow-dry. Long periods of snow cover can cause a myriad of lawn woes.

Many lawns weren't picture perfect going into winter. Snow is nature's airbrush; it masked the flaws but didn't really improve the lawn's condition. As snow recedes, lawns may show damage from salt, plows, voles and molds.

Salt can cause death of lawn grass or cause severe browning of grass blades, generally near sidewalks and roads. Removing any obvious salt and flushing areas with water may help. However, right now more water can cause other problems. Wait until April and reseed areas.

If plows have scraped off lawn areas, use your best puzzle skills and set sod pieces back into place now. Do a little spring dance to assure good soil contact. Sod should reroot.

A couple species of voles can inhabit your yard. Voles can make runways under the snow in lawns as they feed on grass blades and roots. Voles are well protected under the snow from hawk and owl predators. Voles may have brown to reddish-brown fur and range from 4 to 7 inches long. They have stockier bodies and shorter tails than mice. Damage is frequently mistaken as mole damage, but moles are not active during winter. Vole damage appears as surface runways or winding trails of damaged grass. Damage also occurs when my dog tries to dig out the aforementioned voles.

Once spring arrives, grass will usually grow into and fill in the surface runways; however, severe damage may require some overseeding of lawn grass in April. Voles love tall vegetation; therefore, prevent damage from occurring by continuing to mow lawns to a height of about 2 inches until grass is completely dormant in fall. Also in fall, clean up any excessive vegetation near lawns.

Check out web.extension.illinois.edu/wildlife for more information on voles and other wildlife.

Snow mold damage can also be very visible on lawns as snow recedes in spring, especially if we get a prolonged snow cover on unfrozen soil. Both gray (Typhula blight) and pink (Fusarium patch or Microdochium patch) snow mold may occur. During the wet, cold weather of early spring, snow mold may be highly visible as matted, crusty looking areas. Gray snow mold appears in roughly circular yellow to whitish-gray patches. As conditions dry out, snow mold will gradually go dormant.

Often, just leaves are affected and new grass blades grow as weather warms. Severely infected areas may remain in the form of weak or even dead turf. To repair damage, rake matted grass and reseed or resod as necessary in April.

Snow mold severity varies from year to year. Fungicides are generally not needed. Ways to avoid snow mold problems include: follow sound fertilization programs, use fertilizers containing slow-release or controlled-release nitrogen and manage thatch via aerification or removal with vertical mowing (dethatching).

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Receding snow reveals lawn woes