Grubs are the larvae of different kinds of beetles, including May and June beetles (also called white grubs) and Asiatic, Japanese, and masked chafer beetles. The grubs feed on turf roots and may kill the entire lawn. Some birds and animals relish the grubs and dig up the lawn to feed on them. The adult beetles do not damage the lawn, but they do lay eggs in the soil. May and June beetles lay eggs in the spring and summer. Asiatic, Japanese, and masked chafer beetles lay eggs in mid- to late summer. The eggs hatch and the grubs feed on roots 1 to 3 inches deep in the soil. In late fall they move deep in the soil to overwinter; they resume feeding in the spring and may cause additional damage then.
To save areas just beginning to fade, keep the soil moist but not wet.