I have seen mole runs in my backyard for several months. Up until the last couple of weeks or so they seemed to be confined to a natural area constising mainly of scrub oaks and a pinestraw mulch. Now it looks like they have migrated into the turfgrass (centipede). I know they eat grubs and earthworms... and so far there is now sign of any grub damage to the centipede. If I pull up some turf and don't find any grubs, are the moles themselves anything to worry about? Aside from the annoying trails, will they damage the grass? And if I find grubs, what's the best insecticide to apply this time of year? Thanks!!