Two general concepts I'll address.
First, I think the plant looks very much worse than the others seem to think. It's in old sphagnum moss that is breaking down, and that is probably suffocating the roots. I would be surprised if there are any good roots left.
Sphagnum moss is fine for Oncidiums if you know how to use it. The key is to keep it evenly moist rather than soaking wet. If kept moist it retains air spaces. If kept soaking wet there is no air, and the roots rot.
I would take it out of this container immediately and repot into something else. If you are comfortable with using new long-fiber sphagnum moss, that would be fine. A lot of people use fine bark.
I would not cut off any roots. I can't tell for certain which are alive. If the plant is to survive it will begin making new growth, which will begin forming new root.
The second suggestion... don't buy near-dead cheap plants until you have a lot more experience, and can tell which ones are likely to make it. It's not worth your time and money. Buy healthy plants when you are a beginner.
Last edited by estación seca; 06-05-2018 at 01:33 AM..
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