Arum,

In my experience, amorphs can lose a lot of their tuber and still survive. Not to say that they won't be harmed, but they will re-sprout and grow again if the rot doesn't continue to spread. A lot of people dust the cuts with sulfur or a fungicide to prevent more problems.

--Albert

Here is a link that might be useful: Albert's Greenhouse

Albert, thanks for the suggestions! I think at least one third it is gone, if not half, and it is nice and dry. :) Arum