If it is rot, I would water it real well with Thiomyl solution. That's a systemic meant to cure rot. Then figure out how it got started. Does water sit in the crown?
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Ross
http://orchids-ross.blogspot.com/
I don't do most Dendros or large, "floofy orchids". For me it's minis (like Angraecoides), Masdies, Paphs, and others that crept in somewhere along the line. See my orchid list for complete collection (usually not current.)
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