New Dendrobium with yellow rings on new leaves

[Risalegre]

Dear All,
I have attached the pictures of a new joined dendrobium from a discount store (no scientific names since there was no tag on the plant)

The first surprise was to find and deal with the mealy bugs... I never had it before and had to manage to avoid infestation to the other plants by keeping it in quarantine. I was able to deal with the good advice to use isopropyl alcohol. But the orchid got pretty shriveled, I believe due to the mealy bugs sucking on it.

The second surprise was to find the yellow rings in some young leaves (see attached pictures) and was wondering if it can be any viruses or any other kind of thing?

Any advice is really welcome and appreciated.

Thanks in advance,

Risalegre