How do you get rid of lawn grubs?

You walk out to fetch the morning paper, step onto the back lawn, and your heel sinks a little too far into the turf. A few feet away, a patch of grass has turned a dull, lifeless brown, looking like an old doormat tossed over the soil. When you bend down to tug on it, the grass lifts right up in your hands with zero resistance, peeling back like a loose rug because there are no roots left to anchor it to the ground. That is usually the moment you discover you are hosting a subterranean dinner party of white lawn grubs.

Getting rid of these pests is not a matter of simply spraying the surface and hoping for the best. Because these creatures live beneath the turf chewing away at the root system, getting rid of them requires a two-part approach based on timing and biology. You either stop them early in the season before they hatch, or you knock them down later in the summer when they are actively feeding.

The process starts with deciding whether your lawn actually has enough grubs to warrant treatment. A few of these insects scattered about will not hurt a healthy yard, but once numbers cross certain lines, your grass pays the price. You have to match your defense strategy to where the insects are in their life cycle, whether that means using preventive chemicals in the early summer or curative treatments once the damage becomes obvious.

White lawn grubs are the soil-dwelling, root-feeding larval stage of several scarab beetle species, including Japanese beetles and European chafers. These insects spend their early lives underground, chewing through the fibrous roots that anchor your turfgrass to the soil. As those roots get pruned away, the grass loses its ability to take up water and nutrients. The visible damage often looks like expanding, irregular yellow or brown patches in the lawn. You might also notice a spongy feeling underfoot when you walk across the affected areas.

This underground activity frequently draws unwanted attention from above. Raccoons, skunks, crows, and armadillos treat grub-infested lawns like an open-air buffet. They will roll back the weakened turf or dig deep holes to get at the plump larvae underneath. If you see your lawn suddenly torn up overnight, the culprits are usually looking for these exact insects. Understanding this cycle helps explain why surface treatments alone often fail. If the product never reaches the soil where the grubs are feeding, the damage continues unabated.

Before you pour anything on the grass, you need to confirm what is actually eating your yard. Raccoons or skunks tearing up your turf in the middle of the night usually point to a grub problem, but you cannot rely on animal tracks alone. The only reliable way to know is to grab a spade and dig up a few test patches.

Cut out a square foot of turf about two to three inches deep in an area where the grass looks stressed or starts peeling. Lay that section of sod back like a page in a book and look closely at the exposed soil and roots. White grubs are plump, C-shaped larvae that look a bit like pale, curled-up cashews. They usually measure between half an inch and an inch and a half long, with soft, milky-white bodies, distinct brown head capsules, and dark rear ends, plus three distinct pairs of thoracic legs.

Count the grubs you find in that square foot. On a standard, non-irrigated home lawn, finding five to ten grubs in that single square foot usually means it is time to take action. If your lawn is heavily irrigated and pampered with fertilizer, it can often tolerate more than twenty grubs per square foot without showing much distress above ground. If you find legless white worms or tiny slender larvae instead, you are likely looking at billbugs or crane fly larvae rather than true scarab beetle grubs.

Once you have your spade count and know you are dealing with an active infestation, your main practical choice comes down to timing. Do you treat preventively while the beetles are laying eggs, or do you wait and use curative controls against the larger larvae?

If you are treating in early to mid summer, which is typically June or July across most regions, you use preventive options. These are designed to target tiny, newly hatched larvae near the surface before they can do heavy damage. If you are reading this in late summer or early fall and the lawn is already dying, preventive treatments are too late. At that point, you have to switch to curative methods meant to knock down mature grubs that are actively pruning your grass roots.

Whichever route you choose, there is one mechanical step you cannot skip, and that is watering. If the soil is bone dry, give the lawn a thorough soak a few days before applying anything to draw the grubs upward into the root zone. Right after you apply your chosen treatment, you must water the lawn with about half an inch of irrigation. Skipping this step leaves the treatment sitting uselessly on the grass blades or stuck in the thatch layer, miles away from the soil where the grubs are actually feeding.

There are times when handling lawn grubs goes beyond a simple weekend DIY project. If you are managing large commercial turf, an athletic field, or massive acreage where mistakes are costly, you should hand the job over to a certified commercial applicator. Licensed pest control operators also hold access to specialized, restricted-use treatments that are not available on standard garden center shelves.

You also need to think about local wildlife and safety before you act. Digging holes in your yard often attracts uninvited vertebrate predators like skunks, raccoons, armadillos, and crows. While it is tempting to deal with the mammals yourself, remember that wild skunks and raccoons are primary carriers of rabies, and trapping or poisoning them without proper authorization violates state and federal wildlife protection laws. If a wild animal bites someone or shows signs of rabies, contact local public health authorities or animal control immediately.

Finally, keep chemical safety in mind. Conventional treatments for lawn pests can carry high toxicity for honeybees, fish, and aquatic invertebrates. Never apply systemic preventive products to turf where flowering weeds are actively drawing in foraging pollinators, and always follow the product label instructions to the letter to protect the surrounding environment.