I would like to add a note about the Dendrobium. Without knowing exactly what kind it is it would be impossible to explain your leaf loss. Some of them will lose their leaves seasonally, some don't. That being said, the one's that don't will eventually shed their leaves off of the older stems as those stalks die back. The suggestion about leaving the bare canes is a good one, but I would say to leave them alone until they have completely dried up. The bare canes actually feed and support the newer growths.
Hope that was a bit helpful.
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