I have not yet tried it BUT a friend SWEARS by it to prevent spider mite reinfestation. I was pretty skeptical at first but he's had mites for as long as I have known him, and says that 2 treatments with Doktor Doom plus applications of SMC got rid of them and they are gone for good. I am starting to think it's a good product, because his was one of those infestations that would survive a nuclear (nuculur? nucelear? lol sorry Dubya) holocaust.