Quarantine/Prophylaxis for new orchids

[The Peloric Orchid]

So far, I've been lucky not to have any pest outbreaks among my indoor orchids. I've experimented with prophylactic treatments where I sprayed new acquisitions with pesticides (I have tried various) and kept them in a clear storage bin or a 1020 nursery tray with a 7" tall vented humidity dome, but this has resulted in an extremely high mortality rate (probably rot, but haven't conclusively ruled out chemical sensitivities) for new orchids.

If you grow orchids indoors:

1) Do you quarantine your new plants? If so, how and for how long? Ex: separate room, stashing in a clear storage bin, etc..

2) Do you treat new plants with a pesticide? If so, which one(s)?

3) Do you do anything else to mitigate the spread of pests? Ex: repotting into fresh medium