An insecticidal mat which is applied to a portable heat-transpiration apparatus and is capable of maintaining the insecticidal effect continuously over 8 hours or more even in an open space, and a heat-transpiration insecticidal method using the same. A buyer posts a task including multiple sub-tasks. When the surface of the fluid recovery unit rotates out of the body of viscous fluid, an amount of the viscous fluid adheres to the patterned surface.