Abstract: Devices and methods and pesticidal and/or pest control compositions are disclosed for the control of pests using the vapors of a pesticidal and/or pest control composition. Compositions, devices, methods and vapor forming pesticidal compositions which have improved vapor forming characteristics and are desirable under certain regulatory structures are also disclosed. In some non-limiting examples, the pests are arthropods or nematodes, and more particularly may include bed bugs, fleas, lice, ticks, or the like.