Disease? Frost? Twisted Stalk

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I have a few (maybe 2 %) of my irises showing stunted twisted stalks. While there is a little rot in a few irises and some fungus, that doesn't appear to be the case with the twisted ones.  A neighbor also had a couple which were actually spiraled or looped.  Could this have been caused by the extreme cold last winter (-20 to  -25 F.)? Or something else?  I recently noticed a few wire worms while checking for rot but I don't think it was these same irises.

 

Thanks so much, in advance,

Sharon Engstrom

Colville, WA

Zone 4b