Can’t figure out what to do with this Epidendrum radiatum I’ve searched AOS and other sites and can’t find a match. See pictures. Appeared from one day to next both mature and new growth showing this browsing pattern and yellowing. Plant is mature and growing on a palm trunk for years.
I plan to hit it with fungicide, but just guessing at this point. Again, it was sudden onset.
Guidance on how to treat is appreciated!