Ooh I have a couple of nasties hanging around - first one comes to mind in my lil twinkles, not so pretty then theres a mini catt
I think I just grow orchids that suit my conditions, try to maintain my lighting and air-flow with fans. I'm not the best at fertilizing but I do manage one in awhile
Keeping the media nice and fresh not allowing it to break down to the point of mush helps too.
During the winter I try hard to spray down all my orchids with some dish soap every 10 days to 2 weeks. I feel it helps keep those nasty mites at bay.