Oriental Cockroach

Blatta orientalis

oriental cockroach

Adult oriental cockroach (Kansas Department of Agriculture Archive, Bugwood.org)

Oriental cockroach

Oriental cockroach remains (Bestiasonica, Wikimedia Commons)

Oriental cockroach

Oriental cockroach adults and nymphs (Acrocynus, Wikimedia Commons)


  • dark brown to black with wings that are not as long as the body or that appear absent

Nesting Habits

  • often found in basements, cellars, crawl spaces and sewers, near drains, leaky pipes and faucets and under refrigerators and sinks
  • also referred to as “water bugs” because they can be found in cool, damp, dark areas
  • infestations common in spring through fall
  • very commonly come up and out of floor drains


  • garbage and decaying organic material


  • cause allergic reactions, similar to asthma, in some people
  • may transmit disease

IPM Recommendations

  • Prevent roaches from coming out of drains.
  • Improve sanitation.
  • Store food in pest-proof containers.
  • Inspect and monitor all areas where food is prepared, stored, or eaten, and where moisture and heat are present or where floor drains exist.
  • Use cockroach traps to determine infestation level, harborage location, movement and control success.
  • Repair leaks or plumbing malfunctions.
  • Caulk and install weather stripping and door sweeps where cockroaches can potentially enter the building.
  • Use cockroach baits and/or boric acid dust to control populations.
  • Vacuum (with a HEPA filter) roaches and egg cases.

Additional Resources:

Cockroaches fact sheet

IPM for Cockroaches: Integrated Pest Management in Sensitive Environments (University of Nebraska-Lincoln Extension)