I agree with the others that the last picture is the worrisome of the group. A lot of Oncidiums get leaf spotting, much like many if not most Zygopetalums/hybrids. In that case I do believe the spotting is from some kind of fungus but it's more an issue of looks. That said I'd keep the Vanda away from others especially when watering. I had something like Brown Rot on my Huntleya and used Inocucor. The rot stopped but I'm still feeling guarded about the plant...that's another story.
Good luck & keep us posted.
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Hybrid Mode
