White grubs are the larvae of June beetles and similar scarabs. They live in the top few inches of soil and eat grass roots, which is why grub-damaged turf lifts away like a loose carpet instead of tearing.
Two things matter more than identification: how many there actually are, and what time of year it is. A handful of grubs in a square foot is normal in North Texas and needs nothing. Treating full-grown grubs in late fall largely wastes the product.
The signs, in order of reliability
The turf test is definitive. The rest are suggestive.
- Turf lifts away in a sheet with no root resistance. This is the one that confirms it.
- Irregular brown patches that expand through late summer and early fall.
- Spongy feel underfoot before any browning shows.
- Birds, especially grackles and mockingbirds, working the same area of lawn repeatedly.
- Skunks, possums, or armadillos digging conical holes overnight. They are after the grubs.
Count before you treat
Cut a one-foot square of sod about three inches deep, fold it back, and count the white C-shaped larvae in the soil.
| Grubs per square foot | What to do |
|---|---|
| 0 to 4 | Normal. No treatment needed. |
| 5 to 9 | Borderline. Treat only if the lawn is already stressed. |
| 10 or more | Treat. This density causes visible damage. |
Timing is most of the battle
Grubs are only vulnerable while they are small. This is the part people get wrong.
Beetles lay eggs in early summer and the larvae hatch small and feed near the surface through midsummer. That is the window, roughly June into July in North Texas, when a preventive or early curative application actually reaches them and works.
By September and October the grubs are large, they have moved deeper, and their tolerance is much higher. Applications then often produce disappointing results, which is why so many people conclude grub treatment does not work. It works. It was applied two months late.
As soil cools further they move deeper still to overwinter, then come back up briefly in spring before pupating. Spring treatment has the same problem as fall: the target is large and tough.
Repairing the damage
Grub damage kills roots, so the affected turf does not recover. It has to regrow or be replaced.
Bermuda and St. Augustine will both spread back into small bare areas from the edges if the surrounding lawn is healthy and the grubs are dealt with. Give it a growing season.
Areas larger than a few feet across are faster to sod. Water new sod deeply and keep traffic off it, and do not fertilize heavily right away, which pushes top growth before the roots can support it.
Keeping them down without treating every year
Annual preventive treatment is not necessary for most North Texas lawns and it is not good practice.
- Deep, infrequent watering builds deeper roots, which tolerate some root loss without showing damage.
- Beetles prefer to lay eggs in moist soil, so a lawn watered lightly every day is more attractive than one watered deeply twice a week.
- Check the count each summer rather than treating on a calendar. Most years you will not hit ten per square foot.
- Healthy turf with good root depth simply absorbs low grub populations without visible damage.
Key takeaways
- Turf that lifts like a rug with no root resistance is the confirming sign.
- Under five grubs per square foot is normal and needs nothing.
- Treat in early summer while larvae are small. Fall applications on large grubs work poorly.
- Damaged turf will not recover, since the roots are gone. It regrows from the edges or gets sodded.
- Count each year instead of treating on a calendar. Most years you will not need to.
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