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How to kill voles
Keep your grass trimmed short.
Underbrush and grassy areas are great for voles to create hidden runways. Get rid of tall weeds and grass that can act as perfect cover for voles.
Be sure to dispose of grass and leaves when yard cleaning as exposed piles are great for voles, as are piles of wood and debris. Think about what would be good shelter for voles and look to eliminate them from your yard.