German Cockroach vs American Cockroach
BC's two most-commonly-seen cockroach species behave completely differently — and the treatment for one will not work for the other.
German Cockroach
Blattella germanica
World's most damaging cockroach. Now resistant to every major pesticide class simultaneously.
Open the file →
American Cockroach
Periplaneta americana
Runs 530 km/h scaled to human size. Survives a week without its head. NASA studies it.
Open the file →The short version
German cockroach (Blattella germanica) and American cockroach (Periplaneta americana) are both BC kitchen-and-restaurant pests, but they're vastly different in size, behavior, harborage preference, and treatment. German cockroach is the small, fast, multi-generation indoor breeder behind most apartment infestations. American cockroach is the much larger species that lives in sewers, basements, and warm food-service kitchens. Mis-identifying these costs Vancouver food businesses VCH inspection points.
How to tell them apart
- 1
Size: German cockroach 13-16 mm; American cockroach 35-40 mm (over twice the size).
- 2
Color: German is light tan with two dark stripes behind the head; American is reddish-brown with a yellow figure-eight pattern on the pronotum.
- 3
Reproduction: German females carry the egg case until it hatches; American females drop the egg case in a hidden spot.
- 4
Indoor vs outdoor: German is an obligate indoor pest (cannot survive outside in BC); American can survive in sewers, basements, and warm urban infrastructure.
- 5
Treatment: German cockroach control requires bait-driven indoor protocols (gel baits, sanitation); American cockroach control adds exterior + sewer-side intervention.
- 6
BC context: see /pests/german-cockroach and /pests/american-cockroach for the BC field-guide treatment protocols.