Copper Sulphate (CuSO4) Solution as a Fungiside ?
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  #1  
Old 08-08-2018, 06:05 AM
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handiko handiko is offline
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Copper Sulphate (CuSO4) Solution as a Fungiside ? Male
Default Copper Sulphate (CuSO4) Solution as a Fungicide ?

Hello everyone.

I have several hybrid Phal seedlings with sphagnum moss medium. With the day progresses more and more into August, here (in Indonesia) the rain becomes more and more often. The implication is my seedling medium become moist longer than before. Now I only water it about once every week, while a few weeks ago I watered it twice a week. So, as a prevention, I think that I need to spray my seedling with some fungicide.

I have some copper sulfate pentahydrates crystals (CuSO4.5H2O) from many years back still in good condition. And I read somewhere on the internet that copper sulfate solution can be used as a fungicide on crops.

My Question is: Is it true? Can I use copper sulfate solution as a fungicide on orchid? Is there any side effect? What dose should I use?

Any answers are welcome. Thank you.

Last edited by handiko; 08-08-2018 at 06:19 AM..
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  #2  
Old 08-08-2018, 08:22 AM
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Yes, copper sulfate can be used as a systemic and topical fungicide and bactericide, but there are some dendrobiums and thin-leaved orchids that find it to be toxic. (It damaged a coelogyne of mine once.)

For what it's worth, Phyton 27 is a copper sulfate product, with the equivalent of 200g CuSO4-5H2O per liter of water, and that is used by further diluting it to a 0.5%-2% solution.

Back to your original query - water, by itself, is not an issue, and I have found that plants in potting media that are very water-retentive do OK as long as it stays warm and rains a lot. Over the last two months, we have averaged over 1" a day of rain, and my phalaenopsis in sphagnum are doing great.

That, of course, has no bearing upon your outcome, but I think I'd look at changing the potting medium or protecting the plants from the rain before I'd resort to preventive fungicide use.
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  #3  
Old 08-10-2018, 05:47 AM
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handiko handiko is offline
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Copper Sulphate (CuSO4) Solution as a Fungiside ? Male
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Quote:
Originally Posted by Ray View Post
Yes, copper sulfate can be used as a systemic and topical fungicide and bactericide, but there are some dendrobiums and thin-leaved orchids that find it to be toxic. (It damaged a coelogyne of mine once.)

For what it's worth, Phyton 27 is a copper sulfate product, with the equivalent of 200g CuSO4-5H2O per liter of water, and that is used by further diluting it to a 0.5%-2% solution.

Back to your original query - water, by itself, is not an issue, and I have found that plants in potting media that are very water-retentive do OK as long as it stays warm and rains a lot. Over the last two months, we have averaged over 1" a day of rain, and my phalaenopsis in sphagnum are doing great.

That, of course, has no bearing upon your outcome, but I think I'd look at changing the potting medium or protecting the plants from the rain before I'd resort to preventive fungicide use.
Thanks, Ray.

If there's no any side effect of copper sulfate solution on phal (proper dose, of course), I'll try that this weekend.

The media are still newly potted (since May 18), so I don't think I'll repot it for a while.
The current conditions are sphagnum moss + fine osmunda fiber media on plastic compot (about 15 cm dia.), with 10 seedlings per compot, and all the compot protected from the sun and rain by means of a small hut with a semi-translucent white plastic sheet roof. With these conditions, I have a gorgeous growth rate on all seedlings.
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Old 08-10-2018, 02:55 PM
Nexogen Nexogen is online now
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What do you mean? There are no side effects.
If you take antibiotics without need, do you think it's okay?
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Old 08-10-2018, 05:03 PM
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What do you mean? There are no side effects.
I don't know. Maybe like Ray said about the unwanted effect on Dendrobium, Coelogyne, and some thin leaved orchids.
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Old 08-10-2018, 07:21 PM
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Like "Nexie", I avoid preventive treatments of anything.

Basically, you are hoping to compensate for a shortfall in cultural parameters by the application of what is an environmental pollutant.
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  #7  
Old 08-11-2018, 02:15 AM
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Copper Sulphate (CuSO4) Solution as a Fungiside ? Male
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Quote:
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Like "Nexie", I avoid preventive treatments of anything.

Basically, you are hoping to compensate for a shortfall in cultural parameters by the application of what is an environmental pollutant.
I think in my climate area it is necessary to apply preventive treatment for fungi related deceases during monsoon especially from October until February, at least once a month. Even though I have small hut protecting my orchids, it is an open hut, not a closed one like a green house. So when the environment is quite humid so are the media.

Thanks for the advice
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