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Habitat

Blatta orientalis is common outdoors, and lives in warm damp shady areas near the ground or any area containing natural debris. It will often seek refuge indoors when a drop in temperature occurs, but is still quite tolerable of cooler weather. The most common areas to find them are between the soil and foundation, underneath pavements, in sewer pipes, in floor drains, and under sinks or any other damp cool area in the house.

Biology

The oriental cockroach is approximately 1 inch long (22 to 27mm) and dark brown to black. Males have wings covering 3/4 of their body, and the female has very short (rudimentary) wings. The inner wing folds like a fan and is membranous. The outer part of the wing is narrow, leathery and thick. The styli between a pair of jointed cerci can identify the male. Both the male and female are flightless.

Pest Status

They produce characteristic sour smell from there faecal deposits and are known to carry some pathogenic bacteria, which will contaminate human foodstuffs.

Control

Cockroaches often deposit oothecae in cracks and crevices that can be very difficult to treat with insecticides, or by the time the nymphs hatch from the oothecae the application is degraded or removed. Therefore new methods are being developed to manage the roach in combination with regular sprays and dusts. There has been an increased interest in recent years to use juvenile hormone analogues (JHAs) for the control of many insect pests. JHAs have a low vertebrate toxicity, a highly specific biological action and disrupt growth and reproduction in insects, which makes it a good candidate for use in domestic and public environments.

 

German Cockroach

 

American Cockroach

 
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