Dying masdevallia measuresiana!

[NKOrchid]

Thanks for replying - definitely helpful information!
Maybe I should look into s/h. I have not used it ever, but I definitely agree that masdies would enjoy it. This masdie is the only orchid I have that grows in sphag. I have one other where I've put a little sphag on top of bark, to keep the roots in the air more moist for longer. I think my masdie could definitely have been more happy with a medium that dries out a bit faster.

When it comes to quarantine I've thought about maybe trying to "treat" all new plants instead of putting them in closets and placing them as far away as possible. When I say "treat" I'm thinking of submerging the pot in water and then coating the leaves and soil with diatomaceous earth. I just bought it and have no experience with it, but I've done this treatment to all my plants, since it should be completely harmless. Changing the medium as soon as possible would definitely be great, too. It's just pretty often that the plants are in bloom and I'm trying not to repot then.
As mentioned I have a very little apartment and to be honest I don't think storing it in a different room will make a difference, since there are literally no doors in my apartment. This is why I stuck it in the closet, which I will not be doing anymore.
I don't know how I'm gonna find out, but I hope diatomaceous earth will do the trick.

---------- Post added at 02:07 AM ---------- Previous post was at 01:58 AM ----------

Oh, and I can now inform you that the masdie has died. The last leaf has dropped. It really did act quite strange. I did as you said and put it in its own little plastic bag with holes and a humidifier. I kept it evenly moist, but even so it seemed totally dried out and basically dead. Poor plant. A part of me wants to get a new one since I liked it a lot, but another part of me is also pretty discouraged.