I'm almost certain it's a weevil, probably a type of Otiorhynchus. The damage is also typical of them. Some species make holes in the leaves, and others notch out the leaf edge giving it a serrated edge.
In the case of some species, like the vine weevil, the larvae drop down into the soil to feed on the roots. Others, like the orchid weevil (which is not what you have since it doesn't have a long nose) develop in the orchid's bulbs, leaves or flowers.
I think that if you manage to get rid of the adults, you might be able to stop the problem. A lot of species have only 1 generation a year, so you most likely had little white grub eating the roots at one point. Keep an eye on the plants/roots throughout the spring and summer to make sure that they don't come back!