Neem oil as preventative?

[ehuber]

Hi all!

So, I am pretty sure I have some kind of fungus problem on my Brassidium (don't have a digital camera or I would post pictures). I am going to spray that baby down with some neem oil fungicide spray and cut the sections of leaf off that are hopeless.

My question is: since this plant has been nearby some of my other orchids, would it hurt the others to give them a good spray with the neem oil to prevent the fungus even if they don't have symptoms yet?

Any advice you can give would be much appreciated!