Grub‑Proof Your Lawn: Identification, Life Cycle, and Prevention

Grubs—the larvae of beetles like Japanese beetles and European chafers—feed on grass roots, causing brown, spongy patches. Understanding their life cycle is key to prevention.

Life Cycle Basics

Adults emerge in late June, mate, and females lay ~60 eggs in soil. Eggs hatch in two weeks; young grubs feed near the surface, molting through three stages. As they grow, they consume more roots. In fall, they move deeper; in spring, they feed briefly before pupating into adults.

Prevention Strategies

• Monitor lawn in late summer for off‑color patches despite adequate watering.
• Check root zone for small, C‑shaped white grubs.
• Watch neighbors’ lawns—if they have grubs, you likely will too.
• Consider professional lawn care for targeted, timed treatments.

Letting grass go dormant in drought can worsen problems. Early detection and professional intervention yield the best results.