What are grub worms, exactly?

Grubs are the larvae of scarab beetles, including June beetles and masked chafers. They are white or cream-colored, curl into a C shape when disturbed, have a brown head and live in the top few inches of soil, where they feed on grass roots.

What does grub damage look like in a lawn?

Irregular brown patches that feel spongy underfoot and peel back easily, like loose carpet, because the roots holding the sod have been eaten. In Florida, damage usually shows in late summer and fall after grubs have grown large enough to eat heavily.

Why are armadillos and birds digging in my yard?

They are hunting grubs and other soil insects. Heavy digging, especially overnight damage from armadillos, often signals a heavy grub population below. The digging itself can end up doing more visible damage than the grubs.

How many grubs are too many?

A couple of grubs per square foot is normal and healthy turf tolerates it. Extension guidance generally puts concern levels around five or more grubs per square foot, though drought-stressed or newly sodded lawns show damage at lower numbers.

When is the best time to treat for grubs in Florida?

Timing depends on the goal. Preventive treatments go down in late spring and early summer as beetles lay eggs, while curative treatments target active grubs once damage appears in late summer or fall. A professional can match the approach to what is found on the property.

Will grubs go away on their own?

Individual grubs pupate and emerge as beetles, but those beetles lay eggs that start the cycle again. Light populations in healthy, well-rooted turf often cause no visible harm, while heavier infestations repeat and grow without treatment.

Grubs in Your Lawn? Signs Every Florida Homeowner Should Know

Short answer: The classic signs of grubs in a Florida lawn are spongy turf, brown patches that peel back like loose carpet, and digging by armadillos, raccoons or birds. Damage peaks in late summer and fall. Confirm it by cutting and lifting a square foot of sod in several spots: a couple of grubs per square foot is normal, while around five or more usually justifies treatment.

Seeing Spongy Spots or Digging Damage?

RightWay inspects suspicious lawn damage, identifies whether grubs or another pest is responsible and recommends treatment only for what is actually found. Share your address and what you are seeing.

Request a Lawn Review Call (904) 290-6400

What Grubs Are (and Why Florida Lawns Attract Them)

Grub worms are not worms at all. They are the larval stage of scarab beetles, including June beetles and masked chafers. Adult beetles lay eggs in the soil in early summer, the larvae hatch and spend weeks to months feeding on grass roots, then pupate and emerge as the next generation of beetles.

Florida lawns make easy targets. Sandy soil is simple for beetles to burrow into, irrigation keeps the ground soft and moist, and our long warm season gives larvae an extended feeding window. Well-watered, thick lawns are actually the most attractive egg-laying sites, which is why grub problems often show up in the best-kept yards on the street.

grub control in jacksonville fl, lawn pest control in st augustine fl, lawn treatment in st johns county fl — A white grub in its classic C shape: cream body, brown head, six legs. Finding one while gardening is normal; finding many per square foot is a lawn problem. (Photo: Rasbak, via Wikimedia Commons, CC BY-SA 3.0)

The 5 Signs of Grubs in a Florida Lawn

1. Spongy, Bouncy Turf

Walk across the suspicious area. When grubs sever the roots, sod loses its anchor and the ground feels soft, spongy or slightly bouncy underfoot. This is often the first sign homeowners notice, weeks before the grass changes color.

2. Brown Patches That Peel Back Like Carpet

As root loss catches up with the grass, irregular brown patches appear and spread. Grab a handful of browned turf and pull: if it lifts easily with no roots attached, grubs belong at the top of the suspect list. In Northeast Florida this typically shows up from late summer into fall.

lawn pest control in jacksonville fl, grub treatment in ponte vedra fl, lawn care in silverleaf fl — White grubs in their classic curled pose: cream bodies, brown heads, six legs. The cut-and-lift test below turns a grub suspicion into a count per square foot. (Photo: Сарапулов, via Wikimedia Commons, CC BY 4.0)

3. Armadillos, Raccoons and Birds Digging Overnight

Fresh divots, small cone-shaped holes and torn-up turf, especially damage that appears overnight, usually mean animals are feeding on something below. Armadillos are the usual suspects in Northeast Florida, and they rarely dig this persistently unless grubs or similar soil insects are concentrated in the area.

lawn pest control in nocatee fl, grub control in st augustine fl, lawn treatment in jacksonville fl — A nine-banded armadillo, the animal behind most overnight digging damage in local lawns. Persistent digging is a strong hint of a heavy grub population. (Photo: Rhododendrites, via Wikimedia Commons, CC BY-SA 4.0)

4. Beetles Swarming Lights in Early Summer

June beetles and chafers gather around porch lights and streetlights on warm early-summer nights. Heavy beetle activity in June and July often previews grub pressure in August and September, since the eggs those beetles lay become the larvae that feed on your roots.

5. Damage That Ignores Irrigation

Watering a grub-damaged patch does nothing, because the roots needed to absorb that water are gone. Brown areas that keep expanding despite faithful irrigation deserve a soil check rather than more sprinkler time.

How to Confirm Grubs in Ten Minutes

The cut-and-lift test is the standard way to turn a suspicion into a count:

Pick several spots, especially at the edge of brown patches and in sunny areas. One test hole tells you little; four or five tell you a lot.
Cut a square foot of sod on three sides with a spade or sturdy knife, about two to three inches deep.
Peel the sod back slowly. Healthy sod resists because roots anchor it; grub-damaged sod rolls back like loose carpet.
Count the grubs in the exposed soil. They are white, C-shaped and up to about an inch long when mature.
Note the number per square foot across your spots, then replace the sod and water it back in.

Reading the count: one or two grubs per square foot is background noise and healthy turf shrugs it off. Around five or more per square foot, especially with active damage or animal digging, treatment usually pays for itself. Newly sodded or drought-stressed lawns tolerate less.

Grubs, Chinch Bugs or Drought? A Quick Comparison

All three turn lawns brown in overlapping seasons, and the fix is different for each:

Clue	Grub Damage	Chinch Bugs	Drought
Pattern	Irregular patches, worst in sun; sod peels back like carpet	Spreading straw-colored patches starting near pavement	Dry areas match irrigation gaps or slopes
Feel underfoot	Spongy or bouncy from severed roots	Normal firmness	Hard and dry
Responds to watering?	No; roots are gone, water cannot help	No; keeps spreading despite irrigation	Yes; greens up within days
Peak season locally	Late summer through fall	Late spring through summer heat	Any hot, dry stretch

Chinch bug damage deserves a special mention because it is the most common misdiagnosis locally. Our chinch bug damage guide walks through that inspection step by step. Another fall feeder to know is the fall armyworm, which strips grass blades above the surface instead of attacking roots.

Local Lawn Help From RightWay

RightWay's lawn fertilization, weed control and lawn-pest service includes lawn-pest monitoring, so grub activity gets caught at the damage border instead of after the sod starts lifting. Homeowners can also review service information for Silverleaf, Nocatee and other St. Johns County communities.

Service is available in selected Northeast Florida communities. Contact RightWay through the quote form or call 904-290-6400 with your address and a description of the damage.