Grubs are the adolescent form of many beetles. They are C-shaped with brown heads and white bodies. Because they live in the soil and eat the roots of grass, they are damaging to lawns and gardens. If you have a grub problem, there are a number of things to keep in mind when treating your lawn, such as time of year and the type of pesticide to use.
Wait until late summer or early fall before starting treatment for grubs. Grubs are closer to the surface during these times, and will be feeding more frequently.
Decide on a pesticide to use. The best pesticide for an already infested lawn will be designed to kill both the grubs and their eggs. This information will either be advertised with the pesticide or in the instructions for using it. Also consider the toxicity of the pesticide. If you have a garden or fruit-bearing trees that you harvest, choose a non-toxic pesticide.
Put your chosen pesticide into a chemical sprayer.
Use the sprayer to spray the pesticide over your lawn. While spraying, make even full sweeps back and forth with the spray as you walk up and down your lawn. As long as you cover the entire area, most pesticides will work by just going once over.