Hmmmm.... For vole control I built a blacksnake habitat. Put it at one end of the asparagus bed. Just some logs really, in a pattern to allow a snake to slither under there and hide from the sun and weather. Knock on wood, no voles that I can see. Had them some years ago, about killed the asparagus. Have used carbon monoxide from the lawnmower, carbide gas, railroad fusees, you-name-it. No nuclear....

I hates them meeces to pieces!