Use of fungicides, bactericides, soaps and compounds.

[Leafmite]

Originally Posted by orchidsarefun

Agree.
I remember using physan20 once - that caused an explosion of fungal problems as it upset the fungal ecobalance. I had creepy yellow mushrooms/ toadstools suddenly pop up, amongst others and I had a couple of WTF moments.

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Oh my!

I tend to use isopropyl alcohol indoors to dry and disinfect. It is probably not as effective as a fungicide with copper but it is much safer. I have lost a few plants to fungus issues, though, so if OP has a serious issue, OP probably needs something stronger.
My problems with fungus always have occurred in new orchids or when I lapse on the calcium.