What is Happening to My Irsis Root?

I transplanted my Iris's last fall from one house to another. They came up just fine this spring. But earlier this week I saw a small one with two sections of leaves bending ..so When I went to see what was going on, this is what I found on the bottom of the leaves - as they came right up when I touched them..

q what is happening to my irsis root
this one you can see the rest of the small plant, that this used to be attached to.
It looks almost soggy - but other than natural rain (a lot this spring) I have not watered. This is the end plant that this has happened to - afraid it will spread to others down the line.
q what is happening to my irsis root
please let me know what I need to do fi anything to keep from spreading
  7 answers
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