Doktor Doom Spider Mite Knock Out is a .20% pyrethrin formula.Unlike soap based products which need to be applied liberally to the plant in order to drown the insects, Doktor Doom Spider Mite Knock Out® kills the pests on contact with just a light misting on the foliage.Apply the Doktor Doom Spider Mite Knock Out® to the underside of the leaves and then fog the room with a Doktor Doom fogger. The smell of pyrethrin flushes out and eradicates pests on contact.