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Anti-Fungal Ingredients for orchid germination medium?

This is a discussion on Anti-Fungal Ingredients for orchid germination medium? within the Flasking Equipment & Technique forums, part of the Orchid Propagation category; Thanks - will check them out!...

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  1. #11
    SvenLittkowski's Avatar
    SvenLittkowski is offline Rooting Member
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    Thanks - will check them out!

  2. #12
    plucker is offline Member
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    Media formulas with activated charcoal use 2 grams/litre as standard.
    Phytotech sells enough different medias and has the ingredients listed on their webpage including activated charcoal.

  3. #13
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    Hi. I searched for PhytoTech, but there are so many of them with similar services. Can you give me a URL?

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    Ron-NY is offline rothaholic
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    sven I sent you a link in a private message.

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    Thanks, got it. :-)

    ---------- Post Merged at 01:50 PM ----------

    I purchased now Physan 20 (produced by Maril Products inc., USA), which is a liquid with following attributes:
    - Disinfectant
    - Sanitizer
    - Deodorizer
    - FUNGICIDE
    - ALGAECIDE
    - Virucide

    Can I use this fungicide for the orchid germination substrate, and if, in which concentration? Or would it rather kill the seeds or baby plants? I called them already and they told me that this product is stable and won't change during steam-cooking sterilization of the substrate.

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    PaphMadMan is offline Senior Member
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    The active ingredient in Physan 20 is a quaternary ammonium compound. It works well as a surface disinfectant, and can be used on plants because external tissues are resistant, but would be a serious problem in germination medium. An orchid seed is essentially a cluster of naked cells as it germinates, no resistant layers, and would be bleached to death. A good choice for sanitizing your working area, or the inside of a glove box, or for cleaning and disinfecting tools perhaps, but not in the medium.

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