Plant root damage - what type of pest

Once the snow cleared this year I found I have lost a lot of plants. Many of my japanese irises are gone. My daylillies have had half of their roots eaten away (lower half from below). I found piles of roots from my violas (think that is what they are called) stashed under my bushes. Even some new mums have been eaten.
I'm finding holes all over my garden.
I was thinking they were damaged by moles but they are insect eaters so thinking it wouldn't be them.
Any ideas?
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In article
snipped-for-privacy@gmail.com wrote:

http://en.wikipedia.org/wiki/Vole
Losing your Japanese Irises :((( I've had Kousa dogwood root systems turned into spear points. Stuck them in the ground and two came back.
Bill
--
Garden in shade zone 5 S Jersey USA

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