Need help with figuring out what's wrong with this pseudobulb Other than the black spot on the biggest bulb, the plant seems to be fairly healthy. It's spikes are still developing, roots seem to be fairly healthy, and the other bulbs do not seem to show any kind of stress. I don't believe the browning on the leaves are related (but I could be totally wrong!)
I'm hesitant to do any drastic measures (or anything really) until I figure out what's going on with her. I also can't tell if it's spreading or not but it's been there at least since it started growing its spikes.
Neither of the photo links work for me. Can you upload the photos? click on "Go Advanced" and scroll down to Manage Attachments. You can then upload the photos (first select them, then click "upload") Some have said that you have to have 5 posts to upload photos, but I recall people doing it with far fewer.
You are doing the right thing, not doing anything to the plant until others have had a chance to comment. (It's so sad when someone carves up a plant, THEN asks what to do...)There's a huge amount of pooled knowledge on the Orchid Board, and lots of people who are happy to share it. Either you will be assured that there is nothing to worry about, or if treatment is necessary you'll learn how to minimize the impact on the plant.
Well done. I don't see anything worrisome at all. The photo on the left has heavy shadows, and that is the only dark that I can see. The one on the right, I don't see anything either. I think you should just relax, but also observe. If the spot you're worried about gets larger (especially if soft) then you can deal with it. But small flaws on leaves and pseudobulbs are normal, and browning of the small leaves from which the spike emerges is normal too... once the spike has finished, those little leaves have done their job.
There were 4 total photos uploaded (two showed up as thumbnails which I think you viewed and the other two were links). The thumbnail on the right you had talked about was a reference photo -- this is what it looked like at the start of this year!
Just in case, I re-uploaded the photos showcasing the problematic bulbs.
The first of those (links worked, still not seeing thumbnails of 2nd batch) does show the spot. might have been fungal issue, or response to insect damage. It looks dry, so I suggest just watching it. If it gets larger, you could consider surgery with a single-edge razor blade, dusting cut with cinnamon. But if it's stable, just leave it. (You could draw a circle around it with black marker so that you could be certain if it is expanding or not)
If you ever start seeing a yellow spot which then goes black and soft ----- then maybe some rot activity. Maybe that's what happened in your case ----- but your plant may have healed up .... ie. dried up in that region, which is good.
If you do see conditions like that (yellowing, blackening, softening tissue) - then applying some treatment can sort things out.
In Australia, I just use a product called yates phosacid (for example). I just spray some (prescribed quantity) around the affected region.
Also - I notice you inserted your plastic pot into a ceramic/porcelain type cup. That could cut down (or even remove) air circulation. Good air circulation all around, and good drainage is beneficial to the plant.
Last edited by SouthPark; 10-25-2019 at 07:52 PM..
Oncidium Twinkle -- black spot on pseudobulb?
Other than the black spot on the biggest bulb, the plant seems to be fairly healthy. It's spikes are still developing, roots seem to be fairly healthy, and the other bulbs do not seem to show any kind of stress. I don't believe the browning on the leaves are related (but I could be totally wrong!) 
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