This beetle’s white grub larvae can be very damaging to all types of turfgrasses, as well as pasture and agricultural grasses such as hay, wheat, and barley. The adult beetle feeds very little or not at all, only occasionally nibbling at the margins of leaves. The grubs feed in the top 2 inches of the soil, shearing off the roots of the plants. They begin feeding in spring and reach full development by the fall, with only a single generation each year, overwintering as the final instar nymph. Adults begin to emerge from the soil in mid-June and are usually gone by the end of July.
Residual contact insecticides can be applied to plants the adults gather on to kill them before they have the opportunity to mate and deposit eggs. Contact insecticides can be applied to turf to kill the larvae, timed to when the larvae are feeding in the root zone of the turf grasses. Granular insecticides can be very effective once watered in to move the active ingredient into the soil.