Treating the orchids in my sickbay: Zygos, a Phal, and an Angraecum

[BrassavolaStars]

Originally Posted by Ray

Looks to me like you're dealing with acidovorax, a bacterial infection closely related (synonymous, to some) to pseudomonas infections.

It is very easily spread by water splashing, but may also easily be prevented by use of a topical disinfectant like Physan.

It may be treated with the use of copper compounds, like Phyton 27 or Southern Ag Liquid Copper.

It looked like that kind of bacterial brown spot to me also.

My only other concern about the cause was cymbidium mosaic virus as that looks similar.

I do often spray my plants with physan, but it seems I got it anyway.

I would hate to have to get rid of any plants just because of that. The phal I was a bit worried about viruses but I think it is the same bacterial spotting too. Thankfully, zygopetalums are deciduous so I just have to make sure it doesn’t spread to the new growth. I am glad it hasn’t spread around much in the greenhouse either.

I am a bit concerned about using copper around the Dendrobiums. Is there a good way to make sure the Dendrobiums don’t get exposed to too much copper when I use it? Once the zygo orchids have been sprayed with copper, can they still coexist in the GH with the dendrobiums?

Also, I don’t have Phyton but I do have Southern Ag liquid copper. How much per gallon is a good choice?

Maybe I will also spray with cleary’s since the dry, sunken, papery black areas also remind me of fungal spots.

[Ray]

Originally Posted by BrassavolaStars

I am a bit concerned about using copper around the Dendrobiums. Is there a good way to make sure the Dendrobiums don’t get exposed to too much copper when I use it? Once the zygo orchids have been sprayed with copper, can they still coexist in the GH with the dendrobiums?

Simply don't spray them! There is no transfer, plant to plant.

Originally Posted by BrassavolaStars

Also, I don’t have Phyton but I do have Southern Ag liquid copper. How much per gallon is a good choice?

The label specifies 2 teaspoons/gallon, repat at 7-14-day intervals.

Originally Posted by BrassavolaStars

Maybe I will also spray with cleary’s since the dry, sunken, papery black areas also remind me of fungal spots.

Copper is also a fungicide.

Don't forget that these treatments are not innocuous to the plant. Keep treatments targeted and minimized.

[Leafmite]

We always used Captan to control fungus issues with the fruit trees/grapes and roses. It is pretty powerful stuff and you probably want to wear a mask, gloves, and shower very well immediately after using. There are formulas with and without copper.


Robot Check

Here is a good place to look, too:

https://www.staugorchidsociety.org/P...ySueBottom.pdf

[SouthPark]

Originally Posted by Leafmite

We always used Captan to control fungus issues with the fruit trees/grapes and roses.

I bought some of this a while ago. I haven't used it, but have gathered a whole bunch of these treatments - just in case.