Extension > Garden > Diagnose a problem > What insect is this? > Insects found indoors > Beetles, bugs, ants, and other insects without obvious wings - Larger than 1/2 inch long > American cockroach adult
American cockroach adult
Size: 1 1/2 - 2 inches long (nymphs are smaller).
Where/When: Found indoors anytime during the year. Usually enters through sewers and dry drains. Is also associated with steam tunnels in institutions.
Significance: Occasional problem in homes and other buildings. Can be a public health problem by contaminating food and causing allergic reactions and asthma.