OCCASIONAL INVADERS

Sowbugs and Pillbugs in Ontario

Identify sowbugs and pillbugs and reduce the damp exterior conditions that bring them indoors.

Common pill bug, a terrestrial isopod related to sowbugs, Armadillidium vulgare
Actual reference photo: Armadillidium vulgare. CC0 photo via Wikimedia Commons — source and licence.
IDENTIFICATION

What sowbugs and pillbugs look like

These small grey crustaceans have segmented armoured bodies and many legs. Pillbugs can roll into a ball; sowbugs generally cannot.

HABITAT & BEHAVIOUR

Where activity develops

They require moisture and shelter beneath mulch, leaves, boards and stones. Indoor sightings usually occur near damp lower levels and entry points.

VISIBLE EVIDENCE

Signs worth documenting.

01

Grey segmented pests in basements

02

Activity under wet exterior materials

03

Sightings near doors after rain

PREVENTION

Make the property less favourable.

Prevention depends on correct identification and the conditions supporting activity. These steps are a practical starting point.

Reduce damp debris beside foundationsCorrect drainage and ventilationSeal accessible lower-level entry gaps

Identification before treatment

Similar-looking pests can require very different responses. Avoid applying a product until the pest, location and permitted label directions are clear.

Serving Eastern Ontario

Emerald Pest Control serves Belleville, Kingston, Trenton, Napanee, Brighton, Stirling, Picton, Quinte West and surrounding communities.

LOCAL PEST HELP

Not sure whether it is sowbugs and pillbugs?

Send a clear photo and tell us where it was found. We can help confirm the pest and discuss appropriate next steps.

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