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Copper

This is a discussion on Copper within the General Orchid Culture forums, part of the Orchid Culture category; Has anyone ever tried using copper (copper hydroxide) as a fungicide? I'm thinking of giving ...

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  1. #1
    LJA's Avatar
    LJA
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    Default Copper

    Has anyone ever tried using copper (copper hydroxide) as a fungicide? I'm thinking of giving it a shot. You're not supposed to spray it on if the solution's pH is less than 6.5 because of phytotoxicity issues, but I imagine it should be ok using buffered water to mix it. It's supposed to be good as a preventative for Botrytis problems as well; but I was wondering if it would cause the same kind of burn as Daconil does if it hits the blooms. Anyone used this stuff or know of any reason why it shouldn't be used?

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    hi louis....i dont remember the exact details, but i think that ive read copper, in any concentration is toxic to certain tribes (not sure which ones). but of course, no experience with the stuff myself. i thought of getting some phyton-27 when i had the fungus problem, but opted not to do the mail-order thing -- just went to the local boxstore instead and got daconil.

    maybe someone else will write.

  3. #3
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    A long time ago I sprayed a solution of copper sulfate on a vanda that i transferred from a small teak basket to a larger one. It was a stupid thing to do as I grossly underestimated their hatred of root disturbance. It did not do well, although how much of that was due to shock to the roots vs. the copper sulfate (possibly too concentrated for fungicidal purposes) I do not know.

    I have this stuff from Jim Brasch in Canada called Stoprot that is bordeaux (copper sulfate) in lanolin. I have been smearing the gunk on the rot prone phrags in the summertime when the heat here gets uncontrollable. Mostly good results, although I still got some rot (though I suspect that happened when I went away and the plants dried out during a heat wave).

    I unfortunately have not come across any dosage recommendations for the stuff, possibly because there is no commercial interest in its use.

  4. #4
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    Thanks you two. I may just do a trial on something and see what happens. Daconil has been working really well here, but I like rotating chemicals so there's less of a chance that immunities can build up. Dosal was saying that she takes each of her plants out and sprays them individually, but I don't have the time for that, and I'd really like to find something I can blanket the greenhouse with that won't damage the blooms when they get hit.

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