Grubs—the larvae of various beetles—are a fact of lawn care. Most lawns can tolerate a small population but when brown patches appear throughout your yard, you may have a grub infestation that's causing damage to your lawn’s roots. You can battle grubs in the long term with milky spore, which can be purchased in a powdered form at your local home or garden center. It creates a bacterial condition known as “milky disease,” which is harmless to your lawn, but deadly to grubs. You won’t see instant results, but if you apply it year after year, your grub population will dwindle to a manageable level.