Irregular brown patches can mean grubs feeding on roots or simple drought stress — and treating one problem while it’s actually the other wastes time while the real issue keeps spreading.
The tug test
Grab a section of the brown patch and pull. Drought-stressed grass stays rooted even when it looks bad. Grub-damaged grass, with roots already eaten away, pulls up like loose carpet with little resistance.
What else points to grubs
Increased animal activity — birds, armadillos, or raccoons digging at the lawn — is often a sign they’re after grubs underneath, not just random digging.
What else points to drought
Uniform stress across sunnier or higher areas of the yard, improvement within a few days of proper deep watering, and grass that stays rooted are all signs of drought rather than an insect problem.
Why the distinction matters
Watering a grub-damaged lawn more won’t help — the roots are gone. Treating a drought-stressed lawn with insecticide wastes money on a problem that isn’t there. A quick inspection settles it before you treat the wrong thing.
