brown spots on coelogyne
 

I have problems with my Coelogyne mooreana x beccari.
The leaves get brown spots and after while whole leave turn brown. I have lost some leaves allready.
Is this virus or fungus or ...? What should I do :scratchhead: ?

I cannot say for sure what that is, but I would want to remove the ick stuff. I would remove that pbulb in the first pic and treat the wound with cinnamon. I would also remove any infected leaves. However, if that means removing the whole plant, then I guess you could try treating it first.

How long has this been going on? Is it on any of your other plants? I would definitely quarantine it right away and keep it away from the other 'chids. It may not spread or even be possible to spread, but I would be sepearte them in case (someone else might come along though and clear up if it is really necessary).

I would get some Physan if you don't have it and use that. In the mean time some members like Listerine so you could try using that.

I really don't know much about this particular type of 'chid so I don't know how sensitive they are, but my instinct would be to repot, treat the roots and whole plant and repot in fresh medium.

Does anyone else know specifically what this might be or have more specific advice?

Personally, I would test a buch of things on one leaf. Get a sharpie marker and draw circles around a few spots and then test one spot with physan, another with cinnamon, and another with sulphur. That is what I would try personally. Also this way, you can test to see whether or not any particular substance hurts the plant. I know you probably have already done this, but if not, increase the air circulation. If you are damping down at all, I would reccommend stopping that. It almost looks like you have left water droplets on the leaves in the sun and the spots where the water was has burned. Of course, I cannot say for sure. If you want to do a rudimentary test for virus, you can take some leaf ooze and infect a sweet pea. Apparently viruses from orchids can be transfered to other plants, and I guess sweet peas are what "they" use when doing tests. I hope that helps you.

I bought this plant a year ago from Röllke and after two month it started to get spots and then whole leave turned brown. I removed leave and isolated plant from other orchids. Thought that reason was, too could room and placed to warmer room. Then was ok, and then one more leave turned brown. Then I treated plant with insecticide- no respons, got some new brown spots. And as you can see on second picture this leave allready starts to turn brown from edge. Plant was on semi-shade, with no direct sunlight. Now I have it outside hanging on appletree. It seems that higher humidity lead to more new spots. The spots are not wet rotten, rather dry. Shall dry again fungicide and repot. I have lost 4 leaves allready and two more are spotted now. Thought that maybe somebody has seen that kind spots before.
This sweet pea idea is good, but unfortunately I do not have them growing in the garden this summer.

I agree because that is what happened to mine. Mine were fine until I misted them last week. I guess thin leaved orchids are susceptible to spotting, which I didn't realize because I have some hard leaved dendrobs and cattleya. Live and learn.

After first brown leaf I do not give mist to this plant. I only water when it gets dry (usually ones a week at growing period, less at rest period).

I have a Coelogyne fuscescens (photo below) that has those same broad, thin leaves, and it see similar damage off and on, usually if water droplets stand on the leaves at night.

http://www.firstrays.com/Pictures_or...fuscescens.jpg

I got unswer from lab it seems like it is Odontoglossum ringspot virus (ORSV) :(. Have to destroy my plant without seeing any flowers.