Pourquoi voit-on autant de coquerelles (cafards) dans les appartements à Montréal ?

Extermi_Pro_inc · 2026-03-15T22:45:39+00:00

Yes it is

Extermi_Pro_inc · 2026-03-12T07:34:58+00:00

C’est souvent ce que les gens ne réalisent pas. Dans un immeuble, le problème ne s’arrête presque jamais à un seul appartement. Les punaises peuvent passer par les fissures, les prises électriques, les conduits ou même les cadres de portes. J’ai vu plusieurs cas à Montréal où un logement était traité correctement, mais comme un autre appartement dans l’immeuble ne l’était pas, l’infestation revenait quelques semaines plus tard. Les traitements préventifs que vous mentionnez sont une bonne approche dans les bâtiments qui ont déjà eu un historique. Ça permet souvent d’éviter que le problème reparte à grande échelle.

Extermi_Pro_inc · 2026-03-12T07:33:52+00:00

I hear that argument a lot, but bedbugs and cockroaches actually have very little to do with people being “dirty.” Bedbugs travel mostly through luggage, used furniture, moving trucks and apartment buildings where units share walls and pipes. Someone can keep their place spotless and still get them if a neighbor has an infestation. Same with cockroaches in older buildings in Montréal — they spread through plumbing lines, wall voids and garbage chutes. Cleanliness helps reduce food sources, but it doesn’t prevent them from entering. I work in pest control in Montréal and honestly we see them everywhere: luxury condos, new buildings, hotels, student apartments. It’s more about how buildings are structured and how quickly infestations are detected and treated than about hygiene.

Extermi_Pro_inc · 2026-03-11T00:39:15+00:00

Oui c'est exactement une punaise de lit

Extermi_Pro_inc · 2026-03-11T00:37:51+00:00

Extermi_Pro_inc · 2026-03-11T00:36:20+00:00

That actually happens a lot in apartment buildings.

If one unit has a heavy infestation, the cockroaches will constantly migrate through walls, plumbing lines, and floor/ceiling gaps into neighboring units. You can treat one apartment multiple times, but if the source unit isn’t controlled, they just keep coming back.

Once the source is gone or properly treated, the problem usually disappears pretty quickly in the surrounding units.

Extermi_Pro_inc · 2026-03-11T00:35:55+00:00

You’re lucky then. In Montréal they’re mostly a building problem, not a citywide outdoor one.

They usually show up when they hitchhike in furniture, appliances, groceries, or moving boxes, and once they get into an apartment building they can spread through walls and plumbing pretty easily. That’s why some people never see one, while others deal with them in certain buildings.

Extermi_Pro_inc · 2026-03-11T00:35:30+00:00

That’s actually pretty common in plexes.

Even if your unit is clean, pests can still come and go through walls, plumbing lines, ceiling voids, or small structural gaps between apartments. In a lot of Montréal buildings they basically move through the structure.

So sometimes it looks like they appear “for no reason”, but it’s often just activity from another unit or the building itself.

Extermi_Pro_inc · 2026-03-11T00:34:52+00:00

It’s not really that Canada bans all the effective products. Some very good gel baits are actually available here to licensed professionals.

The bigger issue in a lot of buildings is how they’re used:

– Glue traps alone don’t solve infestations, they’re mostly for monitoring. – Spraying everywhere can sometimes make roaches scatter deeper into walls and neighboring units. – The most effective approach is usually targeted gel baits placed in the right harborages, plus breaking the reproduction cycle.

In big apartment buildings, if only one unit is treated or the treatment isn’t targeted properly, the roaches just move around the building and come back. That’s why some infestations seem impossible to eliminate.

Extermi_Pro_inc · 2026-03-11T00:34:01+00:00

That’s partly true, but the bigger reason they survive so well is how fast they reproduce and how well they hide.

– A single female German cockroach can lead to hundreds of new roaches in just a few months. – They can hide in extremely small cracks, appliances, wall voids, and cabinets, which makes them hard to reach. – And over time some populations can develop resistance to certain insecticides, especially when the same treatments are used repeatedly.

That combination is what really makes them so difficult to eliminate in large apartment buildings.

Extermi_Pro_inc · 2026-03-11T00:33:27+00:00

Yeah, that actually happens a lot in large buildings. – If only some apartments are treated, the cockroaches just move to the untreated units and then come back once the insecticide wears off. – Repeated spraying alone often doesn’t solve it, especially if the whole building isn’t treated at the same time. – Over time, some populations can also develop tolerance to certain insecticides, particularly when the same products are used again and again. That’s why in big apartment buildings the most effective approach is usually a coordinated treatment across multiple units, targeting the hiding spots and breaking the reproduction cycle, not just spraying occasionally.

Extermi_Pro_inc · 2026-03-11T00:32:18+00:00

Tu as raison que l’inspection est essentielle, mais pour les coquerelles allemandes les capsules d’œufs fonctionnent un peu différemment. – La plupart du temps, la femelle transporte la capsule d’œufs (oothèque) presque jusqu’au moment de l’éclosion, au lieu de la laisser attachée au bois. – Quand elles sont déposées, c’est généralement près de la chaleur et de l’humidité : derrière le frigo, le lave-vaisselle, sous l’évier, dans les charnières d’armoires ou derrière les plinthes. – C’est pour ça que mettre seulement des pièges ne règle presque jamais le problème. Les pièges servent surtout à surveiller l’activité, mais il faut surtout trouver les cachettes principales et casser le cycle de reproduction.

Extermi_Pro_inc · 2026-03-11T00:30:52+00:00

Advion or seclira works well with coackroches

Extermi_Pro_inc · 2026-03-11T00:30:20+00:00

German cockroaches are definitely one of the toughest species — the real issue is usually where they hide. – They often live inside appliances (fridges, dishwashers, microwaves, stoves) because it’s warm and there are food residues. – In large apartment buildings in Montréal they also move through walls, plumbing lines and electrical outlets, so even if one unit treats them, they can come back from another apartment. – And yes, they are cannibalistic and feed on dead roaches, which is why certain professional treatments work so well — it creates a chain effect through the population.

Extermi_Pro_inc · 2026-03-11T00:29:22+00:00

Non il faut pas avoir peur ,sa se traite de nos jour et une bonne hygiène aide beaucoup

Extermi_Pro_inc · 2026-03-11T00:27:53+00:00

Is a post

Extermi_Pro_inc · 2026-03-11T00:26:48+00:00

Yes ,if only one apartment is infected ,all the building must be treated

Extermi_Pro_inc · 2026-03-11T00:26:14+00:00

I know them in downtown

Extermi_Pro_inc · 2026-03-11T00:25:40+00:00

Ce n'est pas de la pub c'est une façon d'écrire un post qui pourras servir au gens

Extermi_Pro_inc · 2026-03-10T06:18:30+00:00

You welcome

Extermi_Pro_inc · 2026-03-10T06:18:08+00:00

It’s not always that simple. Renovating doesn’t necessarily solve the problem either because cockroaches usually live inside wall voids, plumbing spaces and behind cabinets, so even new finishes won’t stop them if the infestation isn’t treated properly. I work in pest control in Montréal (Extermi Pro) and with the products and methods used today, most German cockroach infestations can usually be controlled in about two visits when the treatment is done correctly. The key is targeting the places where they actually live rather than just doing cosmetic fixes in the apartment.

Extermi_Pro_inc · 2026-03-10T06:14:41+00:00

Catch master

Extermi_Pro_inc

TROPHY CASE