Sow Bug
Porcellio laevis
Also known as: Wood Louse, Slater
The Sow Bug closely resembles the pill bug but is distinguished by its inability to roll into a ball and the presence of two tail-like uropods. Like pill bugs, sow bugs are terrestrial crustaceans that require moisture and primarily feed on decaying plant matter.
Identification
Size
10-15 mm
Color
Dark gray to brownish-gray with lighter edges
Key Trait
Similar to pill bug but CANNOT roll into a ball; has two small tail-like appendages (uropods) at the rear.
Behavior & Habitat
Nocturnal moisture-dependent behavior similar to pill bugs. Cannot roll into a ball for defense. Runs or plays dead when disturbed. Requires even higher moisture levels than pill bugs.
Habitat: Same moist outdoor habitats as pill bugs - under rocks, mulch, logs, and leaf litter; basements and crawl spaces indoors.
Diet: Decaying vegetation, leaf litter, fungi, and occasionally tender seedlings.
Signs of Infestation
- Sow bugs aggregating under objects in moist areas near the foundation
- Dead sow bugs (not curled into balls) on basement and garage floors
- Presence indicates excessive moisture conditions around the structure
Risks & Damage
Invades damp basements and crawl spaces; indicates underlying moisture problems.
Prevention Tips
- 1.Improve ventilation in crawl spaces and basements
- 2.Fix plumbing leaks and ensure downspouts direct water away from the foundation
- 3.Remove ground-level harborage such as mulch, boards, and leaf piles near the structure
Why DIY Treatment Often Falls Short
Sow bugs die quickly indoors from desiccation, so indoor treatments are largely pointless. The real issue is the moisture condition and outdoor population that keeps sending them inside.
Professional Treatment
Professionals focus on moisture remediation, perimeter treatments, exclusion of entry points, and reduction of outdoor harborage to stop the source of invasions.
Frequently Asked Questions
What is the difference between a sow bug and a pill bug?
Are sow bugs harmful?
Why do they die so quickly indoors?
Need Help With Sow bug?
If you're seeing signs of sow bug in or around your home, professional treatment is the fastest way to stop the problem. Lotus Pest Control offers free inspections to identify the issue and recommend the right solution.
At a Glance
- Category
- Occasional Invaders
- Scientific Name
- Porcellio laevis
- Size
- 10-15 mm
- Color
- Dark gray to brownish-gray with lighter edges
- Key Trait
- Similar to pill bug but CANNOT roll into a ball; has two small tail-like appendages (uropods) at the rear.
- Regions
- Pacific Northwest, Northeast, Midwest, West Coast
- Threat Level
- Very Low
- Risk Types
- nuisance
- Seasonal Activity
- MarAprMayJunJulAugSepOctNovDecJanFebnonelowmoderatehighpeak