Detecting bed bugs during the early stages of an infestation and the elimination of bed bugs after treatment are critical in effective management of bed bugs and will minimize the long-term management cost. Unfortunately, bed bugs are difficult to locate during visual inspections due to their small size and cryptic behavior.A full inspection of an occupied room usually requires two experienced technicians and hours of labor. Even so, physical inspections are unreliable and often severely underestimate the actual number of bed bugs in apartments and homes. Bed bugs are attracted to heat, odor, and CO2.  In occupied apartments or homes, baited pitfall traps captured bed bugs that were not detected by visual inspections in apartments and homes. The mean numbers of bed bugs detected by trapping and by visual inspection. In the unoccupied apartment, the baited pitfall trap captured 505 bed bugs (91.1% were nymphs).