Oriental Cockroach


Name: Oriental Cockroach - Blatta orientalis
Lifecycle: Incomplete metamorphosis
Ootheca: Containing on average 16 eggs with a 6-12 week incubation before hatching.
Nymphs: 7-10 moults taking between 6-18months to reach maturity.
Adults: Live on average for 6months. Can be distinguished from nymphal stages by the presence of wings in the males and wing stubs in the females.
A large cockroach, 20-24mm long when adult. A reddish brown to black in colour. Nymphs are similar in appearance to adults with the exception of wings or wing stubs. Males can be distinguished from females when adult by the presence of wings which do not cover the terminal segments of the abdomen. Females will produce on average 5 ootheca, which harden to a dark brown with clear depressions on the dorsal surface.
Primarily nocturnal pest, B.orientalis prefers a moist environment with a temperature range between20-29oC. It can survive outside in Britain although breeding will cease when temperatures drop below 10oC. Consequently it has become a common pest of basements and cellars, as well as often being found in association with toilets, behind baths and sinks, where large numbers will congregate around sources of water.
Signs of infestation
Faecal smears in conjunction with a distinctive odour are both clear indicators of an infestation. Closer examination of likely harbourages should reveal large numbers of B.orientalis grouped together.
Recommended Products – Stingray, Cimetrol, Victor Gel, Nylar 4 EW, Cytrol Forte.
1. The British pest management manual. Section 5, pg 60.
2. ‘The Cockroach, a laboratory insect and an industrial pest.’ P.B.Cornwell. Pg 49
3. Lab notes, Tarakan International.

Click on a recommended solution for this pest below :


One of the ‘flag-ship’ products of the PelGar range, Cytrol Forte is a high strength wettable powder, containing the powerful synthetic pyrethroid cypermethrin. This has excellent insecticidal qualities and good ‘flushing’ and ‘knock-down’ effect.

Victor Gel is a ready-for-use insecticidal gel bait for the control of cockroaches in a range of situations including domestic premises, public buildings, ships and small scale animal housing.

About Us

PelGar International was incorporated in 1995 to develop and supply innovative and novel rodenticide and insecticide products to the global public health pesticide market. PelGar believes that, while the active ingredients used in the industry are common, the target pests and the environment in which they live are very different. Providing cost effective control therefore means that the active substance needs to be available in a wide range of formulations and this is where PelGar’s expertise lies.

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