ok around town there was a lot of damage from voulls. it looks like they made their own cities in the lawn under the snow in the winter time. there are little tunnels everywhere now people are calling wanting to know what to do about it. i have been power raking it and picking up the clipping (dead grass). question: if you leave the dead grass will it fill in on it's own or should i continue to rake it up? and possibly overseed?????????????