There only 6 families of cockroaches found worldwide, consisting of 4000 species. Australia has representatives of 5 of these families but with only 428 species present. Half of a the cockroaches in Australia can be found in the Blattidae family which includes both the native and introduced species
Cockroaches are well known for spreading disease and are associated with various other health risks. Exposure tocockroaches could put you at risk of Salmonella, Dysentery & Gastro-enteritis. Increases in eczema and childhood asthma have even been linked to cockroach droppings.
Cockroaches leave a dust of black droppings less than 1mm wide and of varying lengths.
Check for marks on horizontal surfaces and at wall-floor junctions where cockroaches are active. If water is abundant cockroaches will produce brown and irregular shaped smear marks.
Look for this evidence in locations you suspect they are sheltering. Cockroaches shed ‘cast nymphal‘ skins 5-8 times as they mature to adults.
Look for unusual signs of damage, not just on food packaging. Cockroaches will attack organic goods including leather and books.
An established cockroach infestation produces a lingering and unpleasant musty smell that taints items they contact