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This is a discussion on Do I need Physan 20? within the Semi Hydro / Lights / Greenhouses / Accessories forums, part of the Orchid Culture category; Yes it is used by some people as a preventive fungicide and the instructions that ...
Yes it is used by some people as a preventive fungicide and the instructions that come along with the bottle even suggest once a month preventive applications. It may not cure every disease or fungus that strike your orchids, but it can be a big help with some pathogens and it is excellant in stopping the transmission of these organism's from one plant to the next. AL
Of course it is Selgiene I use now just because Physan is not on sale in UK or the EU for what I call bureaucratic nonsensical reasons.
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And quarantine ? Thats another question. As long as the plant could infect others I guess !