American Cockroach
The largest cockroach found in Ontario, most often a commercial problem in kitchens, bakeries, and heated utility tunnels.
Periplaneta americana
- Length
- 30–40 mm
- Colour
- Shiny reddish-brown with a pale yellow margin around the pronotum
- Scientific name
- Periplaneta americana
How to identify it
Fully developed wings that extend well past the abdomen in males and just overlap it in females. Size alone usually separates it from the others.
It can fly, but only rarely and clumsily. Finding one in a home is more often a sign of a nearby sewer or utility connection than of a household infestation.
Life cycle and behaviour
Why this species behaves the way it does, and what that means for how long treatment takes.
- Egg cases hold about 16 eggs and are dropped indiscriminately by the female.
- Incubation runs 24–60 days depending on temperature — warmer rooms mean faster turnover.
- Nymphs moult seven to ten times before maturing, and adults can live up to two years.
- A female produces 10–15 egg cases across her life.
Where we find it
The harbourage points we check first on a American Cockroach call.
Surfaces where food is stored or prepared, in restaurants, bakeries, and grocery stores
Utility tunnels carrying hot water pipes
Warm, moist service areas and boiler rooms
Floor drains and sewer connections in commercial kitchens
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.
Pennsylvania Wood Cockroach
An outdoor species that wanders into homes and cottages. It will not establish an indoor infestation, which changes the response entirely.
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.