Managing White Grubs in Your Lawn: Timing and Tactics

White grubs can devastate a lawn quickly, but effective control depends on understanding their life cycle. The common advice to wait until July is based on when grubs are most vulnerable.

Why July?

Grubs hatch in late spring and feed near the surface in mid-summer. Treating in July targets the young, actively feeding larvae before they cause major damage.

Early-Season Mitigation

If you see damage before July, a light application of carbaryl (Sevin) can slow them down. Follow label directions exactly—carbaryl is toxic to bees and can be harmful if misused.

Long-Term Prevention

• Maintain a healthy, dense lawn through proper mowing, watering, and fertilizing.
• Apply beneficial nematodes in late summer for biological control.
• Avoid moving infested soil to garden beds; grubs can damage ornamentals too.

Monitor annually and treat preventively if your area has a history of grub problems.