Treat the good part of the orchid after you cut off the rotting pseudobulb. Also soak the potting medium in Physan 20 as well. The bottle should have the 5 to use to soak the medium. Rinse the medium off with plain water then repot the orchid. I would leave the orchid out of pot for a few days to let the cut area heal or treat with cinnamon (see article on main part of the board.) Good luck.
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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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