No, injecting into the holes won't help. Mouse traps will. Unless they're voles. In which case, lots of luck.

You were right, it didn't work. We were fortunate enough to know where they were bringing the food to so we lay some traps around and only caught one. We bought some warfarin resistant bait laced with peanut butter and they went for it. Now I'm finding dead mice in the beds which is a good thing but also gross. I also purchased this product called Super Hunter which I was told would work 100% in keeping any critter that licks or bites away from my hostas. I sprayed it around all the plants and rockery and posts and you name it I sprayed and it has worked. My plants are coming back and I don't see anymore leaves being brought to their hideouts. We'll put more bait out and see what happens.

I am having the same problem. Where did you find the Super Hunter? I found some wasps/hornets, but nothing for other garden critters. Is there more to the name? Thanks!