If you have moles, there is probably a reason why they are there. Moles come into your lawn looking for food and grubs. The best way to prevent mold infestation is by applying a grub control to your lawn to kill the existing grubs before the moles can find them and eat them. If your lawn is scrub free, chances are that it will also be mold free. There are a few different types of grub control that you can use. The first type is referred to as grub ax. It is effective on smaller grubs and will kill them almost immediately. Grub X should be applied in the early to mid spring. If you are treating them in the late spring, it is better to use ortho Max or dylox or Bayer grub control. These other poisons are a little bit stronger, and they can kill rubs even when they are larger and sometimes, they can even kill the beatles.
If you have a mole problem, and don't want to kill the mole, you can try to set a trap for it and remove it once it comes into the trap. Sometimes these work, but if they don't, you'll probably end up having to kill them all in order to save your lawn. You can do this simply by setting a trap inside of one of their tunnels. As they run through the tunnel, the trap will snap and it will kill the mole. An their sense of other way to kill a mole is by using bait. Once again, this bait should go inside of the tunnel. This is because moles will spend most of their time in their tunnels. Even during the day moles are busy digging underground. Moles have no trouble seeing in the dark, and they find most of their Grubs by their sense of smell.