I saw the little mounds in the grass, figured the moles were back. I put down the grub stuff, still more mounds running through the yard. Then the grass in on those mounds started to die. That's when I realized I didn't have moles, it was voles. I treated it again for voles, no more tunnels in the yard, but I guess they didn't leave. The dogs found those tunnels, followed them and dug up every one of them. I have trenches all over the yard. I sure hope those voles never come back.
Yup, one of the tunnels lead to a young Maple tree and they dug under the tree looking for that vole.