Doktor Doom® Spider Mite Knock Out® is a .20% pyrethrin formula that is gauranteed to kill pests on contact with just a light spray. This 16 oz formula is 19 times stronger in active ingredient pyrethrin than any soap based insecticides and 10 times stronger than any formulations that contain Pyrethrin & Piperoynl Butoxide. As a result, it is not approved for organic gardening. Unlike soap based products, Doktor Doom® Spider Mite Knock Out® does not need to be applied liberally to the plant in order to drown the insects, making it convenient to use in all your horticultural gardening systems. Simply apply this product 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.