Hi, I have a persistent problem of Thrips on one of my Dendrobriums. They somehow survive the insecticide sprays, and re-emerge after a few weeks in the blooms. I do not wish to use too much insecticides, and have gotten a bottle of Neem oil. Wonder if it is alright for me to spray the Neem oil solution into the blooms as flowers are where the thrips hide in. Thanks!!