The German cockroach, Blattella germanica, is the most commonly encountered cockroach in apartments, restaurants, hospitals, or other buildings throughout the Pacific Northwest. They frequent areas in which food is stored, prepared, or served.
The adult is ½ inch long, pale brown, with two dark brown lengthwise stripes on the shield behind the head. Adults are fully winged, but rarely fly. Under ideal conditions, adults live up to 12 months.
A female produces eight egg cases during her lifetime, each case containing 30 to 48 eggs, allowing this cockroach to multiply more quickly than any of the other cockroaches found in Washington. Because the German cockroach produces more eggs and has more generations per year (3-4) than other local species, a troublesome infestation can rapidly develop after only a few individuals are introduced.