Moles and vols are always a problem this time of year and Aspen can treat for you. To know if you have a problem check your yard for tunnels. Significant furrows above tunnels in the lawn, with the occasional mound of dirt, indicate mole activity. Smaller furrows and the presence of many holes are evidence of voles at work.
Inspect your plants for damage. Moles are insectivores that eat grubs and earthworms and mostly damage lawns, by tunneling through the root systems. Voles are herbivores that eat bulbs, grass and will even feast on tree bark, leaving a signature "girding" ring around the base of the trunk.
Identify the pest. You are more likely to see a vole than a mole, because moles spend most of their time underground. Voles will travel above ground, especially when there is snow to partially conceal their movements. Moles have paddle feet and long snouts; voles are smaller and look similar to mice.