Dendrobiums and Phyton 27

I've had a friend take care of the greenhouse last week and she noticed that a plant of Dendrobium puniceum has developed some rot. She decided to spray that area of my collection with a fungicide. Her choice was Phyton 27....
I use Phyton on Laelinae, Bulbophyllums, Angraecoids, and Pleurothallids. There were about 30 miniature Dendrobiums in the area that got sprayed. Some very rare oxyglossums and Pedlinonums!!!! I'm freaking out now. The dosage was not super high, about 1 ml per Liter of RO water. Does anybody have any experience with Oxyglossum/Pedilonum Dendrobiums and copper-based fungicides?
What are the symptoms of copper toxicity and how soon do they normally develop?

 

Thank you, Marni. To my friend's excuse, she texted me and asked if I would like her to spray with a fungicide. I have around seven different fungicide varieties and I don't even consider Phyton 27 as one (I use it as a bactericide) so I didn't give her clear directions, thinking that this is a sort of common knowledge that you don't use copper stuff on Dendrobiums, right...
She is an experienced grower but she only grows Cattleyas and Vandas and swears of using Phyton 27 all the time. She was not aware of that common knowledge, unfortunately.
Anyhow, so far D. violaceum, D. puniceum and D. vannouhuysii are showing discoloration of leaves. D. puniceum is 100% a goner. Dendrobium cuthbertsonii, laevifolium, prasinum, alaticaulinum, limpidum, a bunch of cuthbertsonii-based hybrids, Cadetias seem to be unaffected. However, it could be simply too early to tell since they were sprayed on Sunday.

I've heard anecdotal evidences of people using it on Dendrobium moschatum, and even on cuthbertsonii with a concentration twice lower than mine with success. I'll keep everybody updated since the information is scarce and it could be very useful to others.

Marni and Ray, do you think remounting them with a fresh medium could help? Like, are there toxic levels of copper in the medium now?

 

Thanks, Marni. I'll wait on Ray's input.
On a side note, what systemic bactericide do you use? The only reason I kept Phyton 27 is that it really helps with Pseudomonas and Erwinia outbreaks.

 

That's good to know! I'll keep everybody updated on the outcome.
Do you remember what concentration have you used?

 

I sprayed them well with RO so hoping for the best.
Ray, I loved Inocucor. used it a lot but sometimes I would get an unwanted "present" with imported plants from South America or Asia. Last summer I imported a bunch of Pleurothallids from Ecuagenera and some of them arrived with what seems to be untreatable rot. Banrot, Subdue, Physan, nothing worked. Phyton 27 was the only solution that was able to fix them.
I actually just checked the Arbico Organics website and couldn't find Synergro in stock.

 

Out of more than thirty plants sprayed I only lost two, Dendrobium puniceum and D. prasinum. Dendrobium puniceum will be hard to replace but luckily, I have another clone of D. prasinum in my collection.
Dendroboium violaceum lost half of the leaves but is already growing new ones. Other species were not affected at all!