I have the same problem. They seem worse this year possibly because of all the rain. I keep the lawn roller ready to go, and try to smooth out the tunnels each week. But they are still (and always have been) a big nuisance every year. I know they fit into the natural scheme of things, but I wish they would stay out in the corn field or in the wooded areas. I need a break: Haven't tried the gum/cayenne remedy yet. I'll try anything that helps get rid of them!
BTW Nice looking daylilies Sharon: Especially fond of the 2nd two.