The German Cockroach (Blattella germanica) is tan to light brown with two dark parallel stripes behind the head and typically measures 1/2–5/8 inch. The German cockroach (Blattella germanica) is the most common and most difficult-to-control cockroach species in the world, and it is the dominant indoor cockroach pest throughout Arizona. Despite its.

Yes — the German Cockroach is considered a high-risk pest. German cockroaches contaminate food and food preparation surfaces with bacteria including Salmonella, E. coli, and Staphylococcus. Their shed skins, droppings, and saliva are potent allergens that trigger asthma attacks — particularly in children. Infestations escalate rapidly and are extremely difficult to eliminate without professional treatment.

In Arizona, german cockroachs are most often encountered in the following situations: Sightings at night in kitchens and bathrooms, especially when lights are turned on suddenly. Droppings resembling black pepper or coffee grounds on countertops, in drawers, and along wall edges. Egg cases (small, brown, capsule-shaped) in sheltered areas. A strong, musty, oily odor in heavily infested areas. Smear marks along walls near moisture sources.

The German Cockroach is most active during: Year-round indoors. 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.

Eliminate food and water sources: fix leaky pipes, wipe down counters after cooking, store food in sealed containers, and empty trash daily. Seal cracks around pipes, under sinks, and behind appliances. Inspect grocery bags, cardboard boxes, and used appliances before bringing them inside.

Gel bait applications in harborage areas (under sinks, behind appliances, in cabinet hinges), insect growth regulators to disrupt reproduction, and residual sprays. Multiple follow-up treatments are required. German cockroach infestations almost always require professional intervention.

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