Pill Bug
Armadillidium vulgare
Also known as: Roly-Poly, Potato Bug, Doodle Bug
The Pill Bug is a terrestrial crustacean (isopod) commonly found in moist garden environments. It is well known for its defensive behavior of rolling into a ball. While primarily an outdoor decomposer, it invades structures during dry or excessively wet conditions.
Identification
Size
8-18 mm
Color
Slate gray to dark gray, sometimes with lighter edges on segments
Key Trait
Ability to roll into a tight, armored ball when disturbed; convex, segmented body; actually a crustacean, not an insect.
Behavior & Habitat
Nocturnal detritivore that requires moist conditions to breathe through gill-like structures. Rolls into a tight ball when threatened. Aggregates in large numbers under objects.
Habitat: Under mulch, rocks, logs, and leaf litter outdoors; basements, crawl spaces, and ground-level rooms when conditions force them indoors.
Diet: Decaying plant material, leaf litter, fallen fruit, and occasionally tender seedlings and roots.
Signs of Infestation
- Pill bugs congregating under flower pots, mulch, and landscape timbers
- Dead pill bugs curled into balls on basement floors
- Feeding damage on seedlings and strawberries in contact with soil
Risks & Damage
Mass invasions into basements and ground-level rooms during wet or dry extremes.
Prevention Tips
- 1.Ensure proper drainage and grading away from the foundation
- 2.Remove mulch, leaf litter, and debris within 12 inches of the foundation
- 3.Seal all ground-level cracks and gaps, especially where sill plate meets foundation
Why DIY Treatment Often Falls Short
Pill bugs have enormous outdoor populations in suitable habitat. Indoor treatments kill individuals but cannot control the source in surrounding soil and mulch.
Professional Treatment
Professionals apply perimeter barrier treatments, address drainage and mulch issues near the foundation, and seal entry points to prevent mass indoor migration.
Frequently Asked Questions
Are pill bugs actually insects?
Why do they roll into a ball?
Can they damage my garden?
Need Help With Pill bug?
If you're seeing signs of pill 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
- Armadillidium vulgare
- Size
- 8-18 mm
- Color
- Slate gray to dark gray, sometimes with lighter edges on segments
- Key Trait
- Ability to roll into a tight, armored ball when disturbed; convex, segmented body; actually a crustacean, not an insect.
- Regions
- Northeast, Midwest, Southeast, Pacific Northwest
- Threat Level
- Very Low
- Risk Types
- nuisance
- Seasonal Activity
- MarAprMayJunJulAugSepOctNovDecJanFebnonelowmoderatehighpeak