White Grubs

White Grub

Alton N. Sparks, Jr., University of Georgia, Bugwood.org

Description

Lawn Grubs, often called White Grubs, are the immature form of different Scarab Beetles, such as Japanese Beetles, June Bugs (Beetles) or European Chafers. These white, C-shaped creatures have soft bodies with legs near the head. Most Scarab Beetles have a one-year life 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-August, and mate and lay eggs from 2-3 weeks thereafter.

White Grubs feed on grass roots and organic matter in the soil, causing sections of grass in the lawn to die. Grubs eventually turn into adult Beetles and emerge from soil to mate and lay eggs, which hatch into more Grubs.

Damage

As your lawn greens up in spring, keep an eye out for brown patches that never turn green. Those dead patches may be due to Grub feeding that occurred the previous fall. In the summer, irregular-shaped dead patches could indicate Grubs.

If Grubs are present, the dead patch will roll up like a carpet, or you’ll be able to pull up the grass and see that it has no roots. You may also see the C-shaped larvae.

As your lawn greens up in spring, keep an eye out for brown patches that never turn green. Those dead patches may be due to Grub feeding that occurred the previous fall. In the summer, irregular-shaped dead patches could indicate Grubs.

Inspect your lawn to confirm Grubs are present, and 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.

Location

White Grubs are present throughout the United States.
 

Similar or Related Pests

Lawn Grubs, Japanese Beetles, June Bugs, European Chafers