My apologies if this is not the right forum..

I have Bermuda Tiff 419 grass, my neighbor has St. Augustine ( I
think)..his grass has runners that grow under the fence line and take
root in my yard. I spend too much time pulling the runners up and it
really creates problems.

Was thinking of putting in stone footing under fence, so that I could
at least easily use a weedeater to cut the runners off..lots of work
(on a hill, would have to remove panels, dig trend, mortar the stones,
etc in order to stop the runners from growing through.

Anyone have an easier solution??