White mold on Phal bark/roots

[Roberta]

Physan is not copper-based. It contains quaternary ammonium compounds... deadly to fish (DON'T USE IT IN AQUARIUMS!) but otherwise quite benign.

Phyton-20 IS copper based (similar name, very different stuff) I think it's OK on Phals (once got some from a Phal grower) but it is toxic to some orchid genera, can't remember which ones so I just don't use the stuff.

[xiphius]

Originally Posted by Roberta

Phyton-20 IS copper based (similar name, very different stuff) I think it's OK on Phals (once got some from a Phal grower) but it is toxic to some orchid genera, can't remember which ones so I just don't use the stuff.

Ah... thanks! Yes, I was definitely confusing the names. I'll look into Physan if I have problems down the road.

[Roberta]

Physan is also quite good for spaying on greenhouse floors, etc. to kill algae (very helpful for controlling that slippery slime)

[judiwa]

Thank you both for opinions and comments. Our humidity today is 17%, that will probably take care of my mold problem if I leave them a little drier.