PK-H08 · Household invaders
How to get rid of sowbugs and pillbugs
Oniscidea
Need a look-alike split? Use Sowbug vs pillbug, then follow the control sequence on this page.
Sowbugs and pillbugs are isopods, not insects. They walk in from wet mulch, leaf litter, and irrigation against a slab. Dry the foundation, pull organic matter back, and seal door gaps. They do not eat sound timber like termites. Indoor piles after watering mean the basement is still a forest floor.
Sowbugs and pillbugs are isopods. Pillbugs roll; sowbugs generally cannot. They eat decaying plant matter and invade from wet mulch. They are a moisture postcard. Dry the edge, pull organic matter off the foundation, seal. They do not eat sound wood like termites. Indoor numbers mean the basement is a forest floor.
How to identify Sowbug and pillbug
- Armored gray ovals, seven pairs of legs, pillbugs roll into a ball.
- Under pots, mulch, and on basement floors after rain.
Signs of an infestation
- Dozens on a garage floor after watering.
- Clusters under a doormat.
Biology and why they show up
Gills need moisture. Detritivores. Outdoor harborage is the population source.
Health and property risk
Nuisance. Indicate damp conditions that also favor more serious pests.
Proven control sequence
Work in this order. Skipping inspection or exclusion is why most “treatments” bounce back in a week.
- Dry the foundation and basement. Moisture-control page. Mulch back.
- Seal. They wander in; they do not need indoor breeding if you dry the house.
Matching tools for these steps can be bought on Amazon. Buy the field kit.
Tools for sowbugs and pillbugs
Isopods mean damp. Dry the crawl, pull mulch, sweep the sill.
As an Amazon Associate, Pest Kill earns from qualifying purchases. The EPA label is the law for any pesticide. These links match the sequence on this page — they are not a shopping list instead of identification. Details: advertising disclosure. Browse the full tools catalog.
Hardware
Door sweep / garage threshold seal
The gap under an alley or garage door feeds more rats than a bait station on the wrong wall. Measure the gap. A sweep is exclusion, not a gadget.
Hardware
Pin-type wood moisture meter
Damp wood is carpenter-ant and termite language. A meter tells you if the sill, shower wall, or fascia is actually wet before you buy a spray. Wet still needs a building fix.
Moisture-source diagnosis
Isopods breathe with gill-like structures. They die in a dry room. If they keep appearing, look at mulch volcanoes, downspouts dumping at the slab, irrigation heads aimed at siding, a wet crawlspace, or a doormat that never dries. Moisture control for pest prevention is the treatment. A residual on the patio every spring while the mulch remains is a subscription.
- Pull mulch and leaf litter several inches off the foundation.
- Fix grade and downspouts so water does not pond at the slab.
- Aim irrigation away from siding. Let the inspection strip dry.
- Seal garage and basement doors. They wander; they do not need an indoor nest if you dry the house.
- Arizona and other irrigation-belt yards still make forest-floor habitat against stucco — pull mulch and fix the water, rather than treating it as a monthly spray route.
Indoor vs outdoor steps
Outdoors, habitat is the whole program. Indoors, vacuum or sweep, dry the room, and seal. Do not pretend a fogger will replace a downspout. If wood is actually failing, inspect for Subterranean termite separately — isopods eat wet dead plants, not sound framing.
Roll-up behaviour and naming: Sowbug vs pillbug. Related rain invaders: Millipede and Earwig.
Prevention that actually sticks
- Do not volcano-mulch. Fix downspouts.
When to hire a licensed professional
When dampness is a construction defect.
United States and Tier 1 notes
Global. Heavier in humid climates and irrigation belts.
Common questions
Will they eat the house?
They eat wet dead plants. Fix water. If wood is failing, inspect for termites separately.
How do I get rid of pill bugs in the house?
Dry and seal. They came from wet organic matter against the foundation. Pull mulch, fix water, vacuum the wanderers.
Are sowbugs and pillbugs the same?
Both are isopods. Pillbugs roll into a ball; sowbugs generally cannot. Shared control is moisture. See the comparison guide.
Do I need sowbug pest control in Arizona?
You need a drier foundation and less mulch against the slab. Irrigation against stucco still makes isopod habitat. This site is identification and control guidance, not a local dispatch service.