Moles.they are killing my yard?

Try soaking cotton balls in Castor oil and shoving them down the holes. Moles and gophers **** Castor oil.

Pelletized Lime..Spead it over your lawn just before a good rain in the spring and then do another treatment in the fall.You should only have to do this this year and then you should no longer have issues with those little creatures.Thanks to my Dad’s advice I did this last year and have not seen any sense.It sweetens the soil and they don’t like that.

Here is some more Lime Info for you…

Is it a Mole or a Vole?
Most gardeners think of moles when they notice that some critter is tunneling under their yard or garden. When plants and bulbs start disappearing, the moles have nothing to do with it. Moles are insectivores, which means they eat bugs, grubs and worms. If plants are falling over from chewed roots and bulbs are no longer where you planted them, you probably have voles. Another distinguishing factor is if there are one to two inch diameter entrance holes, voles are the culprits.
At this time it is illegal in most states to sell poisons to kill these animals, however it is common knowledge that daffodils are poisonous to voles.

FYI: A study done at Cornell University cited that when under ideal conditions, two mating voles can start a population of 30,000 voles in one acre of land within a one year period!

The Role of Lime in Soil pH
Often the most neglected and under-appreciated area of maintaining a beautiful and healthy lawn is the soil pH. Lime plays a vital role in soil pH levels, and is your tool for creating the proper balance in your lawn. Feel like you are unfamiliar with this area of lawn maintenance? Read on!

The Importance of Soil pH
Soil pH is a measure of how acidic or alkalne the soil is. The scale goes from 1 (acidic) to 14 (alkaline), with neutral being 7.0. Some plants (including azaleas, blueberries, and centipedegrass) prefer acid soil, but most lawns, vegetables and landscape plants prefer a soil pH in the 5.8 to 6.5 range. Plants cannot take up soil nutrients if the soil is outside their preferred pH range. A less-acid pH also stimulates microbial activity, which helps to break down organic material and return nutrients to the soil.

The Role of Lime
Lime is used to raise the soil pH – that is, to make the soil less acid. Lime is just finely-ground limestone. Two kinds of lime are available:
Calcitic limestone contains calcium carbonate (CaCO3) but little or no magnesium.
Dolomitic limestone contains both calcium and magnesium carbonates [CaMg(CO4)2]. This is the material most often found at garden centers.
Lime (both calcitic and dolomitic) is available in the following two forms:
Pulverized (finely ground) lime is inexpensive, and probably the best garden value you will find. This form is excellent for tilling into the soil. Lime dust is not harmful to plants or to humans, but it is irritating to the lungs, so wear a dust mask to avoid breathing it in.
Pelletized lime is a bit more expensive, but much less dusty, and can be applied with a spreader. This form is best for surface application; it does not disperse well when tilled into the soil.

Applying Lime
For new plantings (including new lawns), broadcast lime over the surface and incorporate it 4 to 8 inches into the soil. For established plantings and lawns, apply the recommended lime over the surface. Irrigation or rainfall will help the lime disperse and will wash away any surface dust. Lime takes months to fully react in the soil, so it’s best to apply it well in advance of planting. Lime may be applied at any time of year. Do not surface apply more than 50 lbs of lime per 1000 ft2 at any given time. If the suggested rate is higher, apply 50 lbs initially and the remainder after six months. Retest six months after the second application to make sure the soil pH is in the desired range.

Hope that helps you