Voles eat plants. Chipmunks eat fruit and vegies. Both are easily trapped. Mouse trap for vole. Rat trap for chipmunk.

If you are uneasy about trapping them with a rat trap (the quick humane kill), just keep an eye open for damage. Not just the flowers, fruits and vegies. Tunneling under sidewalks, gnawing into garages, etc.

Over the years I have discovered all rodents will eventually cause problems. I now eliminate them as soon as they arrive. I used to be one of those people that let them ruin something 1st and then react. No more.

That year we had a very high number of chipmunks (the year before had a huge number of acorns come off our oak trees). They had burrows all over the yard, under the decks, in the retaining walls. You couldn't open the door without seeing some run for cover.

I used a "Rat Zapper" to get rid of more than a dozen chipmunks in about a week. I also noticed a red tailed hawk a lot. Then that fall there were scarce acorns, so we had far fewer chipmunks for a while.

The population has come back somewhat this year, I may have to get the Zapper out of retirement.