I am following the instructions on the package - that's why I've been spraying it once a week; what I meant was - how can I tell when I should stop treating the tree for spider mites, how can I tell they are gone (I can't really see the mites, only the very fine web in a couple of places, and even that seems to be already getting better) I'm assuming there's no typical length of treatment, I should be able to see the difference in its overall appearance, but, again, my bonsai looks pretty healthy, and I'm concerned about exposing it to excessive amounts of insecticide ;(