I sprayed the entire plant with listerine this mornjng. I used the original listerine just in case this might be a fungal thing. Funny thing is the plant was fine until all the flowers dropped off and was placed under the lights.
My miltassia Charles m Fitch "Izumi" just lost two leaves a week or so ago. I think it is just the time of year that oncidiums want to drop a leaf or two.
Last summer, my ovals all dropped a leaf in perfect unison! It was so uncanny.
My miltassia also has weird mottled brown marks that form on the top bulb leaves just like yours, but I have yet to figure out what it is or if it is a symptom of a worse issue.