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This is a discussion on Physan use on orchid roots within the Orchid Ailments / The Compost Pile forums, part of the Orchid Culture category; I have a problem regarding the use of Physan 20 on orchid roots. I have ...
I have a problem regarding the use of Physan 20 on orchid roots. I have a phal wich I think has a root fungus problem. Does anybody use it on roots, and if you do, how do you proceed? And how do you dilute it? Please tell me how many ml pel liter of water, because I am a little confused about using teaspoons per gallon (we don't use gallons as a volume measurement unit) and I am affraid to not overuse, as I heard it can burn the plant. Thanks in advance!
I've used it for years on my orchids. It's a mild fungicide/bacteriacide. It doesn't harm the orchids or the roots at all. One important thing about mixing, fill your container with water and then add the physan. It creates an incredible amount of foam if you put the physan in first and then add water. Now as far as mixing, the recommended dose is two teaspoons per gallon (2.6 mls per liter) .
Last edited by tucker85; October 21st, 2011 at 01:31 PM.
I use it at recommended strength every time I repot. I leave the orchid submerged in the solution overnight as well as the potting medium that I'll be using and I've never had any problems.
Ok, I figured it out, the recommended dose is 2.6 ml per liter. I have used up to 4 mls per liter with no problems.
I'm using physan whenever I've problems: 1,7 ml physan/1 l of water.
We do have some problems with U.S. measurements, don't we, Gabi
1 US galon = 3.7 liter
1 tablespoon = 10 ml
1 teaspoon = 5 ml
So, using tablespoon per galon...is using 1,7 ml physan for 1 liter - my own experience.
Gabi, if I were having the problem with roots that you are having, I'd soak the whole plant in: nine parts water, one part bleach, mixed together. I've used this and it works. Soak for 5 minutes...Betty
Thank you for your replies! Yes Branka, it is a little bit confusing, as we don't use gallons, nor do we use teaspoons as a measurement unit. I'll use physan the next time I'll water my phal. Thanks again!
any idea where I can find Physan in Bucharest? I can only get rather strong fungicides like Captan from the phytopharmacy. Please PM following the forum rules.