There are approximately 3500 species of cockroach in the world and about 450 species in Australia. Only seven of these species, all introduced, are regarded as pests.
Pest cockroaches are undesirable insects in our environment. Cockroaches move quickly, are often associated with dirty conditions, and when present in large numbers can even produce a mild ‘musty’ odour. Cockroaches carry bacteria on their bodies from sewers, drains, garbage containers and other unhygienic areas then transmit these bacteria to humans by visiting kitchen and bathroom areas.