Over the last several years I have had the same problem with my hostas. It is voles. I use to have big beautiful hostas and now I have lost several. I have tried traps to no avail. I can't use poison because I have small dogs and I fear they will dig it up. The last thing I tried was wire mesh baskets to cover roots of new hostas I planted to try to keep the voles away from the roots. The only thing I think really works good is having an outside cat to catch them. When I had an outside cat I never had a problem with voles.
Over the last several years I have had the same problem with my hostas. It is voles. I use to have big beautiful hostas and now I have lost several. I have tried traps to no avail. I can't use poison because I have small dogs and I fear they will dig it up. The last thing I tried was wire mesh baskets to cover roots of new hostas I planted to try to keep the voles away from the roots. The only thing I think really works good is having an outside cat to catch them. When I had an outside cat I never had a problem with voles.