Pennsylvania Wood Cockroach
An outdoor species that wanders into homes and cottages. It will not establish an indoor infestation, which changes the response entirely.
Parcoblatta pennsylvanica
- Length
- 22–30 mm (males), 12–20 mm (females)
- Colour
- Yellowish-chestnut brown
- Scientific name
- Parcoblatta pennsylvanica
How to identify it
The thorax and wings are edged in a pale border, and the antennae are notably long. Colouring varies noticeably between parts of the province.
Because it cannot sustain an indoor population, the fix is exclusion and moving woodpiles away from the wall, not repeated interior treatment.
Life cycle and behaviour
Why this species behaves the way it does, and what that means for how long treatment takes.
- Females produce an egg case every 5–9 days, each releasing 24–30 nymphs.
- Total lifespan is about one year.
- It feeds on organic matter, fungi, and sweet or fermenting material rather than household food.
- Common through Central Ontario, and a frequent late-spring cottage complaint.
Where we find it
The harbourage points we check first on a Pennsylvania Wood Cockroach call.
Beneath loose bark, in stumps, and inside hollow trees
Wood piles and ground litter stacked near the building
Indoors only as an accidental wanderer, usually near doors and lights
Around exterior lighting at night — males are strong flyers
How cockroaches are actually controlled
Cockroaches need food, water, and shelter. Removing any one of them puts the population under stress, and that does more long-term good than spraying ever will.
Cut the water first
Condensation on a cold water pipe is enough to sustain a colony on its own. Fixing leaks and bringing humidity down removes the hardest resource for them to replace.
Close the harbourage
Cockroaches are thigmotactic — they settle in cracks tight enough to touch their backs and bellies at once. Caulking crevices around plumbing, cabinets, outlets, and countertops takes those spaces away permanently.
Clean before treating, not after
Residual product applied to greasy or dirty surfaces is close to useless. Degreasing and HEPA vacuuming first both removes insects physically and lets the treatment work as intended.
Monitor to find the hotspots
Traps behind the fridge, under the sink, inside cabinet voids, and in bathroom vanities show where the population actually sits, so treatment goes where it counts instead of everywhere.
Source: Ontario Pesticide Training & Certification — Appendix A: Pests of Structures, and Appendix B: IPM for Structural Pests.
Other Cockroach Control species
Not sure which one you have? Compare the others we treat in Ontario.
German Cockroach
The most common and most prolific cockroach in Ontario buildings, and the one behind the majority of kitchen and bathroom infestations.
Brown-banded Cockroach
Hides higher up and further from water than other species, so it turns up in living rooms and bedrooms rather than only kitchens.
Oriental Cockroach
The damp-basement cockroach. Slower and less wary than the others, and the one species that does not want a warm, dry room.
American Cockroach
The largest cockroach found in Ontario, most often a commercial problem in kitchens, bakeries, and heated utility tunnels.
Send us a photo and we'll identify it
Correct identification decides the treatment. A licensed technician will confirm the species before anything is applied.