White grubs
Scarab larvae
Turf feels spongy underfoot and peels back like loose carpet because the roots are gone. Skunks, raccoons and birds tearing up the lawn overnight is the other giveaway.
Preventive, always. A long-residual product goes into the root zone in round 03 and kills larvae as they hatch. By the time fall damage shows, the grubs are large and much harder to kill.