White Grubs, often called Lawn Grubs, are the immature form of different Scarab Beetles, such as Japanese Beetles, June Bugs (Beetles) or European Chafers. These white, worm-like creatures have soft bodies with legs near the head and curl into a C-shape when disturbed. Most Scarab Beetles have a one-year reproductive cycle; June Beetles have a three-year cycle. Timing varies by beetle species and region, but generally adults emerge from the soil from mid-May to August, mate and lay eggs back in the ground 2-3 weeks thereafter.
Damage From Grubs
White Grubs feed on grass roots and organic matter in the soil, causing ever-expanding sections of the lawn to die. They do the most damage from late summer into fall but you may not realize how bad it is until the following spring.
If Grubs are present, the dead patches will often roll up like a carpet, or you'll be able to pull up the grass and see that it has no roots. You should also see the C-shaped larvae. Animals like skunks, raccoons and armadillos digging in your lawn can also be a sign of grubs. They are searching for Grubs to feed on.
Further inspect your lawn to determine the extent of the infestation. A healthy lawn can easily support a Grub population of zero to five grubs –and possibly as many as nine per square foot. Scout a lawn in late summer by digging several sections of sod 1-foot square and 2 to 4-inches deep. If Grubs are present and feeding, you'll see them in soil.
Where White Grubs are Found Geographically
White Grubs are common throughout the United States.
Related or Similar Pests
Lawn Grubs. Japanese Beetles. June Bugs. European Chafers.