Pests such as beetles, worms, crickets, ants and other root-feeding grubs can thrive in your lawn and damage them. Grubs are larvae of various common lawn beetles. They burrow into the soil and feed on the roots of grasses, leaving brown, ugly patches in your lawn. If you see too many birds frequenting your lawn, it may be because your lawn has been infested with bugs and grubs, on which the birds feed on. Knowing the type of pests attacking your lawn will allow for a more efficient and faster lawn treatment.