I have tried just about every known method to get rid of them and the voles, mice and shrews that use their runs. They are the ones who eat the tulips, etc. I have 7 cats, and one of them is a very agressive hunter. Even he can not keep up with the moles, voles, mice and shrews. Moles come for the nice juicy worms in your carefully cultivated lawn and flower beds. They also like japanese Beetle grubs. I seem to have less tunnels if I can keep down the japanese Beetles. Worms I have to keep, they till and fertilize the soil for me. Actually, moles help ariate the soil also, they just make an unsightly mess while they are at it.
Moles eat the worms and make the tunnels through which the voles scamper to eat the bulbs. After spending a lot of time, and wasting a lot of water washing the dirt back down into the holes, I have learned to just live and let live. AND - bulbs get planted in containers only!!!!!!
Yep - on the voles/bulbs. Had a huge circle of tulips all in bloom stage or near to it, when they suddenly went into wilt mode. I knew they were not lacking water - so I did some investigative digging and found the munched bulbs. I might not have even noticed if it had been a singleton loss, but this was an entire "patch".