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Here is a link that might be useful:

Pic link 2

Here is a link that might be useful:

They are probably vole holes. Voles are actually field mice not moles. Voles eat bulbs and roots of plants. If you've ever had a plant die and you pulled it and it was a stem sitting in a hole, the roots were eaten by a mole. I have lost many tomato plants to them.

Here is a link that might be useful: Vole holes

Ronnywil meant to say:
" If you've ever had a plant die and you pulled it and it was a stem sitting in a hole, the roots were eaten by a vole."

I'd try planting some castor plants. They repel most underground varmints without causing damage to other (earthworms/grubs) wildlife. Just be sure to keep your animals and little ones/children away from the beans/seeds as they are deadly poisonous. The seed heads grow high (6 feet+) on the plant and can be harvested for replanting before they disperse and offer little ones or pets the chance to get at them.

This post was edited by Easy69 on Thu, May 23, 13 at 22:56