Moles & Voles
Moles typically dig tunnels that can destroy lawns and gardens. They can kill plants while they tunnel and remove soil around roots. The unprotected roots dry out and die. Plant diseases may also be spread by the moles. Pests like voles, field mice and other rodents use these tunnels as well to feed on exposed roots.
Signs of vole infestation are when the bark has been removed completely around the base of a tree, or the sight of 1 to 2 inch wide dead strips through matted grass leading to shallow underground burrows.