Voles are rodents that look very similar to mice that wreak havoc to turfgrass in the wintertime. Every four to five years there is a spike in their population and they can create areas like this. 2009 is one of those highly populated years. These vegetarians can eat through turfgrass and perennial plants quickly and leave you with much less plant material in the spring than you had in the fall.
Over the past few years we have noticed most of these areas come back in time, but over seeding and getting proper nutrients to the damaged areas are a must. A few other observations we have noticed, first they fear fungicides and any areas that were applied with fungicides in the fall, keep away from through the winter. Also they stay away from the Nordic track and any other compacted areas. It is impossible for them to burrow through the ice layers.
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