Doktor Doom® Spider Mite Knock Out® is a 0.20% pyrethrin formula. This formula is 19 times stronger in active ingredient pyrethrin than any soap-based insecticides and 10 times stronger than any formulations that contain pyrethrin & piperonyl butoxide. Piperonyl butoxide is a synergist that enhances the killing power of pyrethrin and it is not approved for organic gardening. 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 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 insect pests on contact.