The Three-Lined Cockroach (Luridiblatta trivittata) is tan to brown with three dark longitudinal stripes and typically measures 1/2–3/4 inch. The three-lined cockroach (Luridiblatta trivittata) is a small, distinctively marked cockroach found in desert scrub, rocky terrain, and dry grasslands throughout Arizona and the broader Sonoran Deser.

The Three-Lined Cockroach is generally low-risk, but caution is still advised. The three-lined cockroach is primarily a nuisance pest. It is not a significant health risk and rarely establishes indoor infestations.

In Arizona, three-lined cockroachs are most often encountered in the following situations: Small, striped cockroaches found under rocks or in rocky desert terrain near the home. Occasional sightings near the perimeter of homes in desert communities. More common after monsoon rains.

The Three-Lined Cockroach is most active during: Most active during and after monsoon season (July–September). 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 ground-level gaps around the foundation. Remove rock piles near the home. Standard perimeter pest control treatments will deter occasional intrusions.

Standard exterior perimeter treatments are effective. Entry point sealing prevents occasional indoor intrusions.

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