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Adult life span may be a few months to over a year, depending on the species and conditions.
The female may produce up to 5-30 egg cases (ootheca). The ootheca are purse-shaped and often contain about 12-40 eggs in each case.
Role as pests and ways to tell if I have a
Cockroaches are one of the most commonly noted household pests. Their appearance and their role in the transmission of disease is usually the main concern.
Cockroaches may contaminate various areas with droppings and vomit marks. As they often dwell in areas such as sewers and grease traps, they develop the growth of organisms and bacteria causing disease harmful to humans. The most common disease transported is Salmonella (food poisoning).
They feed virtually on any human and animal food.
The signs of cockroach infestation include: carcasses, body parts, shed skins, empty egg cases, vomit marks and foul odour owing to secretions from the mouth and cuticle.
Places you will find cockroaches include: sinks, hot water systems, kitchen appliances, eg: fridge, dishwasher, microwave, stove etc, cracks and crevices, bathroom, stored boxes, roof voids and subfloor areas, wall cavities and external areas.
Cockroaches leave chemical trails in their feces as well as emitting airborne pheromones for swarming and matting.
Other cockroaches will follow these trails to discover sources of food and water, and also discover where other cockroaches are hiding.
There are about 4000 species of cockroach that exist.
Cockroaches are generally rather large insects. Most species are about the size of a thumbnail, but several species are bigger.
Cockroaches have a broad, flattened body, with a relatively small head. They are flattened so they can make use of tight hiding places in cracks and crevices.
The mouthparts are on the underside of the head and include generalised chewing mandibles. They have large compound eyes, two ocelli, and long, flexible antennae. The legs often have protective spikes and are suitable for crawling on many different surfaces.