Here is the picture (I hope)
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This is a discussion on OMG! What is it!?! within the General Orchid Culture forums, part of the Orchid Culture category; I went outside to water the orchids that are summering outside (they are living under ...
I went outside to water the orchids that are summering outside (they are living under a tree in my front yard), and my Encyclia Brassavolae was covered in spots! I consulted the book the AOS sent me when I joined and it said fungus or virus. I've never had the misfortune of seeing a virus (and hope I never do) so I don't know which it is. I bought it in may of this year from Andy's Orchids and as far as I know it's always been healthy.
We've had several days of rain and humidity's high. The fact that it happened so suddenly makes me lean toward fungus, but I took pics so I could get other to give an oppinion. I've already sprayed it with antifungal and separated it from the herd.
Here is the picture (I hope)
Here's another picture...
And yet another....
Lisa, that to me looks more like a bacterial infection. Do you have any Physan or RD-20? If you don't, you can use listerine full strength or a 5-10% bleach solution (bleach diluted in water). From the pics, it looks like all of the leaves are covered in those spots. Bring the plant in, out of the rain and humidity, and wipe the whole thing down top to bottom, undersides of leaves, PBs, everything, with the listerine or bleach. Repeat that again in a few days. You won't be able to rejuvenate those leaves, but you might be able to keep the infection from spreading and killing the plant.
Wish that didn't have to happen....
What caused it? Should I treat the plants that were around it?
This is my first summer of putting my orchids outside. I only did it because I was urged to on GW forum, and I had reservations about doing it. Now I'm battling bugs and bacteria. I'm ready to go outside and bring everyone back in where it's safe.
I'm sorry if I sound discouraged, but I am!
Don't be discouraged! Putting plants outside for the summer can be very healthy for them, you just have to really stay on top of potential problems, especially with this weird weather / so much rain. That usually means spraying with some type of disease control and insecticide a lot more often than you would if you kept the plants indoors year around.
The pics look as if some insect had pierced the leaves first: each of those spots seem to surround a tiny hollow. The infections more than likely arose when bacteria invaded the tissue pierced by the insects, and your high humidity and rain provided perfect conditions for spreading. I could be wrong on that, but it's my best guess.
It certainly wouldn't hurt your other plants if you treated them too, so if you have the time, you may as well just go ahead and spray them / wipe them down with the bleach or listerine. (Alcohol works too, just dilute with a little water first so the evaporating alcohol doesn't cause more damage by creating "cold spots"....)
How about Lysol spray?
I've never used Lysol spray on plants, so couldn't tell you how that would turn out. My initial reaction would be not to use it, but if you wanted to experiment, you could post your results and we'd all learn something!
don't be discouraged by the outdoors--it's a real pain sometimes, but for certain genera, i.e. standard catts, cymbidiums, even dends & oncs, a summer outdoors really helps them bloom well in the winter.