The American Cockroach (Periplaneta americana) is reddish-brown with yellowish figure-8 pattern on the pronotum and typically measures 1.5–2 inches (largest common cockroach in Arizona). The American cockroach (Periplaneta americana) is the largest cockroach species commonly found in Arizona homes and businesses, with adults reaching up to 2 inches in length. Despite its name, it is b.

Yes — the American Cockroach is considered a high-risk pest. American cockroaches carry and spread bacteria including Salmonella, E. coli, and various pathogens picked up in sewers and drains. They contaminate food and food preparation surfaces. Their shed skins and droppings contribute to indoor allergen loads and can trigger asthma.

In Arizona, american cockroachs are most often encountered in the following situations: Large (up to 2 inch) reddish-brown cockroaches seen at night in kitchens, bathrooms, or basements. Droppings that are larger than German cockroach droppings — cylindrical with ridged sides, about 1/4 inch long. Egg cases (dark reddish-brown, about 3/8 inch long) near food sources or in sheltered areas. Musty odor in heavily infested areas.

The American Cockroach is most active during: Year-round; most active and most likely to enter homes during summer heat. 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 floor drains with drain covers. Fix leaky pipes and eliminate standing water. Seal gaps around plumbing penetrations. Install door sweeps on exterior doors. Keep basements and crawl spaces dry and well-ventilated.

Exterior perimeter treatments with residual insecticides, drain treatments, and targeted interior applications near plumbing. Bait stations in basements and crawl spaces. Entry point sealing is critical for long-term control.

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