Roly Poly Bugs in Collin County, TX | Pill Bug Identification and Control
The pill bug (Armadillidium vulgare), the roly poly, is a small gray crustacean, not an insect, that rolls into a tight ball when touched. It breeds in damp mulch beds against Collin County homes and wanders inside after heavy rain. It does not bite or sting, and Texas A&M AgriLife Extension says pill bugs rarely survive more than 1 or 2 days indoors because a house is too dry for them.
Roly polies coming in under the back door? Our office sits where McKinney, Plano, Frisco and Allen meet, 5 to 10 minutes from most homes in those four cities. Call and we will find the damp beds they are breeding in and the gaps they use to get inside.
Pill Bug
The pill bug is a land crustacean that lives under damp mulch, stones and leaves and comes out at night to eat rotting plant matter. Texas A&M AgriLife Extension calls it one of the most common small creatures in Texas landscapes.
Risk Assessment
Choose a row for the full detail- Color
- Gray to brownish or gray-black
- Diet
- Rotting leaves, mulch and grass clippings, and tender seedlings
- Threat level
- Low
- Defining behavior
- Rolls into a tight ball when touched
- Where it hides
- Under mulch, stones, pots and boards on damp ground
- Lifespan
- Up to 3 years
- Size
- About 3/8 inch, with seven pairs of legs
What Does a Roly Poly Look Like?
A small gray oval with an armored back that rolls into a ball when you touch it
A pill bug is a small oval creature with a domed back made of overlapping plates, like a tiny suit of armor. The Insects in the City fact sheet on pill bugs from Texas A&M AgriLife Extension describes the common pill bug as generally less than 1 cm long, brownish to gray-black, with seven overlapping plates over the middle of its body and seven pairs of legs. Touch one and it rolls into a tight ball, the habit behind the name roly poly.
It is not an insect at all. The Field Guide to Common Texas Insects calls pill bugs and sowbugs land crustaceans, closer kin to lobsters, shrimp and crayfish, and notes that they even have gills. That is why they need damp ground. They spend the day under mulch, stones and leaves and come out at night to feed on rotting plant matter.
How to identify a pill bug by its armored gray shell, its seven pairs of legs and the tight ball it rolls into when touched
- Rolls into a tight ball when you touch it
- A small gray oval with a shell of overlapping plates
- Seven pairs of short legs, not the six of an insect
- Dozens under a flower pot, a stone or a door mat on damp ground
- Dead, dried ones on the floor just inside a door after a wet spell
- Seedlings or strawberries chewed at soil level overnight
Other Names for the Pill Bug
Roly poly is the name most people search for, and it comes from the way the animal rolls up. Penn State Extension lists pillbugs, roly pollies and doodlebugs as names for the same land isopods, and Clemson’s Home and Garden Information Center adds woodlice. Woodlouse is the British name, which is why the red spider that hunts them is called the woodlouse spider. Penn State also notes the common pill bug came from Europe and spreads in mulch, plants and compost.
The one name that means a different animal is sowbug. A sowbug is a close cousin that looks almost the same but cannot roll up. The field test below shows how to tell the two apart.
| Name | What it means |
|---|---|
| Roly poly | From the way it rolls into a ball. |
| Pill bug | Rolled up, it looks like a small pill. |
| Doodlebug | Another nickname for the same animal. |
| Woodlouse | The British name, after the dead wood it lives under. |
| Sowbug | A different animal, a cousin that cannot roll up. |
How to Tell a Pill Bug from a Millipede or Sowbug
Pill bugs and millipedes turn up in the same damp mulch beds and walk in under the same doors after rain. How each one curls up, and how many legs it has, tells them apart.
| Species | Size and Color | Key Feature | Where Found |
|---|---|---|---|
|
Pill Bug
AKA: Roly Poly, Doodlebug
Armadillidium vulgare
This species
|
About 3/8 inch long. Gray to brownish or gray-black. | An oval, armored back and seven pairs of legs. Rolls into a tight ball when touched. | Under mulch, stones, pots and leaves on damp ground, and just inside doors after rain. |
Millipede
AKA: Thousand-Legger, Garden Millipede
Oxidus gracilis
|
The garden millipede is 1/2 to 3/4 inch long. Gray to brown. | A long, thin, wormlike body with two pairs of legs on most segments. Curls into a coil, not a ball. | Under mulch and rocks, and in mass walks into garages and homes after heavy spring rain. |
Pill Bug vs Sowbug
The Pill Bug in Three Numbers
1 or 2 days
Texas A&M AgriLife Extension says pill bugs rarely survive more than 1 or 2 days indoors, because a house is too dry for an animal that breathes through gills.
Texas A&M AgriLife Extension, Insects in the City
30 to 80
The same Texas A&M AgriLife Extension fact sheet reports that a female pill bug gives birth to 30 to 80 young at a time, with two to three generations a year in Texas.
Texas A&M AgriLife Extension, Insects in the City
3 years
The Field Guide to Common Texas Insects says a pill bug may live up to 3 years, a long life for a creature about 3/8 inch long.
Field Guide to Common Texas Insects, Texas A&M
Do Roly Polies Bite, and Are They Dangerous?
No. Pill bugs have chewing mouthparts made for rotting leaves and mulch, and they do not bite or sting people. Clemson’s Home and Garden Information Center calls sowbugs and pill bugs completely harmless to humans and pets, and Iowa State University Extension adds that they cannot damage household furnishings. Picking one up does no harm, so there is no first aid to give.
Are Pill Bugs Harmful to Dogs and Cats?
No. The same Clemson fact sheet says they are harmless to pets as well as people. The bigger worry around pets is what gets put down for pill bugs. Texas A&M AgriLife Extension warns that slug and snail baits can be harmful to children and pets if they are not applied exactly as the label directs.
When Pill Bug Activity Needs Attention
Pill Bugs Inside Every Day
A few after a storm is normal. A steady stream on the floor means a big population is breeding in damp beds right against the house, and a gap is letting them in.
Seedlings Eaten Overnight
In wet years new transplants can be eaten to the ground in one night. Check the bed after dark with a flashlight to see whether pill bugs are the cause.
A Few After Heavy Rain
Rain soaks the mulch and some wander in under the doors. They dry out and die within a day or two, so sweep them up.
Pill Bugs in a Houseplant
Clemson notes they can settle in house plants. Let the soil dry between waterings and empty the saucer under the pot.
Why You Have Pill Bugs in Your House
Pill bugs come inside by accident. Their home is the damp ground along the foundation, the mulch beds, the soil under pots and stones, and the leaf litter by the fence. When heavy rain soaks those beds, or a long wet spring builds their numbers, some walk in under a worn door sweep, a garage door seal or a crack at the slab. Clemson’s fact sheet notes that many in a home usually means a large population outside.
Once inside they are in trouble. A house is too dry for an animal that breathes through gills, so most are found dead or dying near the back door within a day or two. It is not a sign of a dirty house. It is a sign of wet beds outside.
Where Pill Bugs Live Around Collin County Homes
Pill bugs live wherever the ground stays damp and dark. Texas A&M’s field guide places them by day under stones, logs, leaf litter and other debris, feeding at night on mulch, grass clippings and other rotting matter, and on tender young plants. Around a Collin County home that means foundation beds, the soil under pots, planters, firewood and pavers, the cool part of a compost pile, and anywhere a sprinkler keeps the slab edge wet.
Pill Bug Pressure Across Collin County
Pill bugs come up in our service notes most often in McKinney, with Allen, Plano and Prosper behind it, usually in foundation beds, under porches and along the slab. The heavy rain of spring 2026 brought more of them, and snails with them, right up to homes in Plano and Allen.
In Princeton we find them in sheds and outbuildings where boxes and boards sit on damp ground. Any yard with watered beds against the brick, in any Collin County city, can carry them.
Pill bugs live in Collin County yards all year. They breed mainly in spring, and numbers climb fastest in a wet one. In a dry summer they dig down into the soil, in a wet summer they stay busy at the surface, and in the cold of winter they slow down.
Pattern from Texas A&M’s field guide, which says pill bugs breed mainly in spring, and from Pest Me Off service records, which find them most from late spring through summer and again in fall.
Why Pill Bugs Keep Coming Back
How Pest Me Off Gets Rid of Pill Bugs
Pill bug control happens outside. Spraying the kitchen floor does little, because the pill bugs in the house are already dying. The four steps below go after the damp beds they come from.
Inspect and Identify
We walk the foundation beds, pots, pavers, porch and shed, confirm it is a pill bug and not a sowbug or millipede, and find where they breed and where they get in.
Treat the Source Outside
Granules in the mulch beds and lawn and a liquid treatment along the foundation, where pill bugs gather against the slab.
Close the Way In
We treat the weep holes along the brick and show you the worn door sweeps, garage door seals and slab cracks they walk through.
Dry Out the Beds
We show you what keeps the ground wet, from sprinklers hitting the brick to deep mulch against the slab and pots sitting flat on the soil.
& Other Companies
How to Get Rid of Pill Bugs Yourself
Most of the work is taking away the damp shelter they breed in. Texas A&M AgriLife Extension says the best way to get rid of pill bugs is to destroy their breeding and hiding sites.
Why Some DIY Responses Fail for Pill Bugs
Most DIY pill bug trouble comes from treating inside the house, adding thick fresh mulch in a wet spring, or scattering garden baits where children and pets can reach them.
Spraying Inside the House
Clemson’s fact sheet does not recommend insecticides indoors, because pill bugs dry out and die quickly inside. The source is the wet ground outside.
Thick Fresh Mulch in a Wet Spring
Mulch is food and shelter for pill bugs. Texas A&M suggests thin layers until the weather dries out, since a deep fresh layer feeds more of them.
Snail Bait Scattered Carelessly
Slug and snail baits get scattered for pill bugs, but Texas A&M warns these products can harm children and pets if misapplied. Follow the label exactly.
Common Roly Poly Questions
What is a roly poly?
Is a pill bug an insect?
Do roly polies bite or sting?
Are pill bugs bad for dogs and cats?
Why are there roly polies in my house?
Why do pill bugs roll into a ball?
What is the difference between a pill bug and a sowbug?
Do roly polies eat plants?
How long do pill bugs live?
How do I get rid of roly polies?
Roly Polies by the Back Door? We Go After the Beds They Come From.
We find the damp beds they breed in, treat the foundation and mulch outside, and show you the gaps and the moisture to fix so fewer come back. Pest control across McKinney, Allen, Frisco, Plano, and all of Collin County.