How to Scout for Grubs in Your Lawn (And Why You Probably Don't Need to Treat)

A homeowner asks how to test for grubs.

Simple Grub Check

1. Find a transition zone between damaged (tan) and healthy (green) grass.
2. Cut a 1-ft square flap 2–3 inches deep; peel back like a carpet.
3. Count white C-shaped larvae. Threshold: 5–10 grubs/ft² may warrant action; fewer is normal.

Key Facts

• Every healthy lawn has some grubs. They’re food for birds.
• Chemical treatments kill predators (birds, beetles, nematodes, wasps) that keep grubs in check.
• Most lawn damage is NOT from grubs—check for drought, disease, compaction, or pH issues first.

If You Have a Real Problem

Apply beneficial nematodes in late summer/early fall. They target grubs without harming beneficials.

Don’t treat based on fear. Scout, confirm, and use biology—not chemicals.