Laboratory experiments on structure and color of a box trap affecting trap efficiency of Culex pipiens form molestus

e e ciency of box traps was evaluated by release-capture laboratory experiments of Culex pipiens form molestus. e basic box trap (13L×18W×10H cm) was composed of three parts, a shading-plate, a top board, and a collection box. e shading-plate was attached to the end of the top board at a 45-degree angle. Under the shading-plate there was a rectangular opening (9×9 cm) on the top board, which connected to the collection box. e inside wall of the collection box was covered with a sticky sheet. It is suggested that the angle of the shadingplate be between 45 and 90 degrees, the size of the opening be between 9×2 cm and 9×9 cm, the top board be black or red, and the height of trap setting position be less than 80 cm from the oor to maximize the trap e ciency. When the mosquito density was low and multiple traps were placed in a room, the relationship between the overall trapping probability (Ps) and the number of traps (n) was described by the following equation: Ps=1−(1−p)n, where p is the trapping probability achieved by a single box trap in the room.