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Physan 20

This is a discussion on Physan 20 within the General Orchid Culture forums, part of the Orchid Culture category; As I was reading a few articles posted on the forum , I noticed the ...

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  1. #1
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    Question Physan 20

    As I was reading a few articles posted on the forum, I noticed the use of Physan 20 to kill any fungus/bacteria during repotting. More reading suggest that Physan 20 should be sprayed on the leaves monthly.

    Questions:
    1) Is Physan really an important product that those who have a growing collection should use?
    2) Should Physan be used monthly during watering, and if so, should it be rinsed after the plat has soaked in it?

    Other advice/suggestions welcomed.

    Chris

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    Physan 20 is a mild bactericide/fungicide that is best used to help prevent problems rather than used to treat problems.

    I use it on orchids that are kept moist most of the time, to prevent fungus problems in the medium. For me that's phalaenopsis which are also susceptible to bacteria problems. I haven't tried it on paphs so I can't comment on them. Since my cattleyas, encyclias and vandas dry out completely between waterings, I don't worry about fungus in the medium although it certainly can happen.

    I use Physan 20 at 1 teaspoon per gallon to soak the medium of all my phalaenopsis, approximately once a month. I don't really spray the leaves but it does get on the leaves and it doesn't hurt them. I don't rinse it out of the medium after applying because it's very mild and takes a while to work. Occasionally during the summer when it's very humid I'll spray all my orchids and even the orchid benches and the floor of my orchid growing area to help prevent fungus problems.

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    Chris, your questions should be answeard with locaton and climate in mind!

    In wet and very humid climate it can be used and meybe needed.
    In dry climate it is seldom needed except now and then. I myself has never needed it on my potted plants outside my growing cabinets.

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    Update: I used Physan 20 on all my orchids yesterday; took over five hours. I soaked each orchids roots, and sprayed each and every leaf top and bottom. My concern is that I misread the instructions and used on Tablespoon per gallon in the first batch, but used the product's directions of 2 teaspoons per gallon thereafter. My hope is that I have not totally killed my orchid collections.

    On the positive side, there was a gnat problem over the past several months. It looks like the Physan has taken care of it...no gnats to be found anywhere.

  5. #5
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    Like I posted earlier, the dose that most growers use as a preventative treatment is 1 teaspoon per gallon. The maximum recommended dose is 2 teaspoons per gallon.
    One other point, always fill the container with water before you add the Physan. If you put the Physan in first, you'll produce so many bubbles that you won't be able to get the water into the container.

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    Thanks, Tucker. Luckily, I read your advice about the "water before adding the Physan" from a previous post and did so. Good thing, because it does create a lot of bubbles.

    I will probably do an earlier-than-scheduled watering of my collection just to flush out the first batch that was over treated. In Austin, we have a rather dry climate so will only do the Physan treatment during the winter when it is more humid.

  7. #7
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    Quote Originally Posted by chrisa View Post
    Thanks, Tucker. Luckily, I read your advice about the "water before adding the Physan" from a previous post and did so. Good thing, because it does create a lot of bubbles.

    I will probably do an earlier-than-scheduled watering of my collection just to flush out the first batch that was over treated. In Austin, we have a rather dry climate so will only do the Physan treatment during the winter when it is more humid.
    Physan is pretty mild and I doubt that a one time slight overdose will adversely effect your orchids.

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