Plumeria Rot!

Plumeria Rot!

I received my cuttings yesterday. Two of them look great, but the third... The cut end is hollow and rot has travelled up the stem about five inches or so. I tried cutting off the rot as far as it went up the stem so that it can re-cure but the central part of the stem is already seperating from the inner part. I'm not sure it will survive, and I don't have a lot of experience with plumeria. So what should I do? Keep cutting?
Plant Identity

Plant Identity

my room :)

my room :)

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Harvest

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help identify

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Terraece update

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Calendula