moles
Mark, you have moles because you have grubs. Get rid of the grubs and you
will not see the moles. Grubs are the larvae of Japanese beetles, June
beetles, and some other beetles. They do not like to lay their eggs in
grass that is cut 2 inches or higher. So you have several choices. You
can use an insecticide, designed to kill grubs to get rid of them this
year; then raise you mower and by next year the numbers should be down
enough for the moles to move to your neighbor's yard. If you want some
reinforcement, hang at least three Japanese beetles traps around the
perimeter of yuour property, buy some DOOM (milky spore disease) to apply
in May or June, and also apply an insecticide to kill grubs in late August;
all that along with raising your lawn mower gets rid of moles. In the
short run, you can trap moles easier than setting up a barrier. The
harpoon trap is the most effective; lethal but effective.