Well, when I tried to cut just the rot away, I found both bulbs were rotten in the centers so I removed both of them, applied a little hydrogen peroxide and dabbed them with cinnamon. I'm only concerned that I didn't cut deep enough into the rhizome to get rid of all the rot, but I didn't want to be over zealous. This is my first time treat pbulb rot. I took some pictures as I went, just so others could see what was happening.
First two pics are the bad pbulbs. The next two pics are where I started to cut into the pbulb. The fifth picture is the inside of one pbulb I removed. The last two pics are post removal after I applied the hydrogen peroxide.
Hopefully I can save the plant, but if not, at least it's been a learning experience.
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