The tobacco beetle, Lasioderma serricorne ( Coleoptera: Anobiidae ), and the tobacco moth, Ephestia elutella (Lepidoptera: Pyralidae ), infest cured tobacco leaves and are serious pests of stored tobacco. These insects were monitored to clarify their population dynamics in tobacco factories and warehouses where Integrated Pest Management (IPM) has been instituted. Pheromone traps for both species have been developed and used as common monitoring tools in many tobacco companies. A pheromone trap generally consists of a pheromone lure that attracts insects and a sticky trap that catches them. The total efficiency of a pheromone trap depends on efficiencies of the pheromone lure and the sticky trap. Ideally, all individuals attracted by a pheromone lure would be caught on a sticky trap, and the capturing efficiency would be constant. However, in some cases, the surface on a trap becomes less sticky due to various factors (e.g., dust, ultraviolet rays, drying, and the number of insects already caught on a sticky trap). In the present study, we present factors that affect the sticky surface of two pheromone traps, "NEW SERRICO" for the tobacco beetle and "GACHON" for the tobacco moth. We also describe the relationships between the factors and capturing efficiencies of the sticky traps. This information enables us to appropriately use both sticky-pheromone traps