Grubs are c-shaped, white or gray larvae of beetles that feast on the roots of your grasses. If they are not treated properly they have the potential to leave nothing behind but dead turf.
If you suspect a grub problem look for: large irregular brown patches in the grass that can be rolled back like a loose carpet. If 2-5 grubs are found per square foot, an insecticide applications should be applied. Moles, skunks, or raccoons in your yard can indicate a grub problem because these animals feast on grubs. Damage is common in midsummer.