Species Insects & ArthropodsOriental Cockroach

Oriental Cockroach

Blatta orientalis

CommonInsect & Arthropod
Illustration of Oriental Cockroach (Blatta orientalis)

The Oriental Cockroach is a large, shiny dark brown to black cockroach that prefers cool, damp basements, sewers, and drains — earning the name 'water bug.' Males have shortened wing covers while females are nearly wingless. It moves more slowly than other pest cockroaches and is associated with moist, cool environments rather than kitchens.

Habitat
Basements, sewers, drains, and damp human structures
Diet
Adults and nymphs: decaying organic matter, garbage, and starchy materials
How common
Common

Best time to see a Oriental Cockroach

The best time to see a Oriental Cockroach is April–July, when about 66% of U.S. sightings happen, based on 4,156 research-grade iNaturalist observations.

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Not certain it is a Oriental Cockroach? What bug is this? walks through what to check first and the lookalikes that catch people out.

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