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Old 12-18-2018, 02:11 PM
john lapointe john lapointe is offline

Join Date: Dec 2017
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Location: Marthasville, Mo., USA
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toxicity Male
Default toxicity

Physan 27 use, which orchids is Physan toxic to? There is not a list with the bottle of Physan. I've heard read that it is toxic to Dendrobiums, are there others I shouldn't use it on? Thanks for input
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Old 12-19-2018, 09:39 AM
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Ray Ray is offline
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toxicity Male

In my experience, unless you apply it in too concentrated a dilution, Physan 27, a quaternary ammonium salt disinfectant, is not phytotoxic at all.

Phyton 20, on the other hand, is a copper-based systemic fungicide and bactericide that can severely damage many dendrobiums, and thin-leaved species like coelogyne, bollea, zygopetalum, and the like.

It is unfortunate that the two products have such similar names, as it can cause confusion.
Ray Barkalow, Orchid Iconoclast
Try Kelpak - you won't be sorry!
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dendrobiums, input, physan, read, toxic

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