Pest Fact Files‎ > ‎

Cockroach (Oriental)

Common Name:          Oriental Cockroach

Scientific Name:          Blatta Orientalis

Class/Order/family:      Insecta/Blattodea/Blattidae

Metamorphosis:          Incomplete





Approximately 2.5cm in length. Very dark brown to almost black. Neither males nor females can fly and females only have rudimentary wing pads. The females are broader than the males.


Nymphs moult between 7 - 10 times. Nymphs mature in 24 to 130 weeks.


Each egg capsule contains about 16 eggs. The female carries the ootheca for about a day then drops it onto a protected surface near to a food supply. The female does not attach the ootheca to a surface. The eggs hatch in around 60 days.



An average female will produce approximately 8 ootheca during a lifetime. One difference with the Oriental Cockroach is that it does tend to follow a seasonal breeding cycle with maximum breeding taking place in spring to early summer.




The average lifespan of an adult is 35 – 182 days.




They like a damp environment and move slower than other species. They are less likely to quickly disperse if disturbed. They can be found in drainage systems as they prefer wetter conditions. They also prefer a slightly lower temperature than the other common species found in the UK. They live on decaying organic matter and will often be found in bins and rubbish. The Oriental Cockroach can survive for a month without food providing a water source is available.