Is anyone aware of a safe, effective pesticide that a has a lasting residual effect in the Pacific Northwest climate? I have a large and diverse collection of plants and I am constantly fighting off infestations of aphids, whitefly, spidermites, tent caterpillars, slugs etc. etc. ad nauseum. I hate to use toxic chemicals to combat these pests, but honestly I have found "organic" alternatives to be almost useless. I have purchased SaferSoap, XKL and other products and applied them at full strength only to find aphids alive and well the following day! I have also made "teas" by boiling tobacco, soap, cayenne pepper and god knows what else. Some of these are effective against aphids but they don't even bother whiteflies and spidermites. I spend a lot of time grooming and tending my plants, I also apply composted manure and fertilize regularly. I would love to hear from anyone that has had success at keeping their garden toxin AND pest free!!!