The general consensus on here is that if it's safe for roses, it should be safe for orchids. After some experimentation on my end, I'm inclined to agree. I've never had problems using a rose product on my 'chids.
I just wish that the BBS would sell Orthene. The best I can get is Sevin or Bayer.
But as I said, once the pests are everywhere, in my experience, it's a real chore to get rid of them with a systemic.