American Cockroach



Name: American Cockroach, Periplaneta americana
Lifecycle: Incomplete metamorphosis
Ootheca: Containing on average 6-16 eggs with a 5-14 week incubation before hatching.
Nymphs: 9-13 moults taking normally 5 months to reach maturity at 25-30oC.
Adults: Live on average for 15 months. Can be distinguished from nymphal stages by the presence of wings.
A large cockroach, 28-44mm long when adult. A shining red-brown with a paler yellow area around the edge of pronotum. Nymphs are similar in appearance to adults with the exception of wings. Males can be distinguished from females when adult by the lengths of the wings which extend past the terminal segment of the abdomen in the males. Females will produce on average 10-15 ootheca every 10months, which harden to a dark brown with clear depressions on the dorsal surface which the female will then cement to surfaces with chewed materials in prime environmental locations for ootheca development.
Primarily nocturnal pest, P.americana prefers a warm, moist environment with an optimum temperature of 28oC. Less of a pest in the UK it primarily infests locations near to ports as well as being found in heated locations such as zoo’s green houses and animal houses.
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 P.americana grouped together.
Recommended Products – Stingray, Cimetrol, Victor Gel, Nylar 4 EW, Cytrol Forte.
1. The British pest management manual. Section 5, pg 65.
2. ‘The Cockroach, a laboratory insect and an industrial pest.’ P.B.Cornwell. Pg 53
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.

Contact Information

  • Address: PelGar International Ltd, Unit 13 Newman Lane, Alton, Hampshire, GU34 2QR, UK
  • Tel: + 44 (0)1420 80744
  • Fax: + 44 (0)1420 80733
  • Email: [email protected]
  • linkedinfacebooktwitter

Quick Contact