[Cynthia, Prescott, AZ]

Thought I'd check my old copy of 'The Orchid Doctor', a 1980 compendium of literature references to various things orchid related. There is a comment on being injurious to buds (phytotoxic), and that it consistantly does damage to Den moschatum, Den puchellum, and others. I seem to recall it was deadly to mule ear Oncidium leaves. I think I'd stick with the Rose & Flower. A friend with a larger very highly mixed collection than I have has reported no damage what so ever with imidaclorprid, and I have used it used it once on my entire collection (~1000 plants) with also no appearent damage.