The Australian Cockroach (Periplaneta australasiae) is reddish-brown with yellow markings on wing margins and pronotum and typically measures 1.25–1.5 inches. The Australian cockroach (Periplaneta australasiae) is a large cockroach that closely resembles the American cockroach but is distinguished by yellow markings along the outer edges of the wings and a.

The Australian Cockroach poses a moderate risk. Australian cockroaches carry bacteria and pathogens from outdoor environments. They contaminate food and surfaces when they enter living areas and contribute to indoor allergen loads.

In Arizona, australian cockroachs are most often encountered in the following situations: Large cockroaches with yellow wing margins seen near greenhouses, nurseries, or heavily irrigated landscaping. Sightings near outdoor lighting at night. Occasional indoor sightings near entry points.

The Australian Cockroach is most active during: Year-round in warm areas; most active in summer. Arizona's warm desert climate can extend activity periods compared to other states, so year-round vigilance is recommended in the Phoenix metro and surrounding areas.

Seal gaps around doors, windows, and utility penetrations. Reduce dense, heavily irrigated vegetation near the home. Install door sweeps. Replace white exterior lights with yellow bulbs.

Exterior perimeter treatments with residual insecticides, targeted applications in irrigated landscaping, and entry point sealing.

Cockroaches are nocturnal and highly secretive — seeing even one during the day is often a sign of a larger hidden population. Australian Cockroachs reproduce rapidly, so early intervention is critical. Contact Pest Control Bros for a thorough inspection if you spot one.