Lawn Grubs, often called White Grubs, are the immature form of different Scarab Beetles, such as Japanese Beetles, June "bugs" (beetles) or the European Chafers. ... They feed on grass roots (and organic matter in the soil), causing sections of grass in the lawn to die.

What kind of bugs eat grass?

What do beetles feed on?

Diet. They feed on plants, small insects and animal fibers, depending on species. A few beetles are considered pests in gardens and crops, although some species may benefit humans by killing harmful insects. Adults often deposit their eggs near the food that the larvae will eat when they hatch.