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