Butterandjam, Sorry to hear you lost so many. Most reputable dealers will replace them for you. It could be a coincidence that most of the ones that rotted were from the same provider. Were they all planted in the same area? If your soil is too acid, you can have more rot then normal. I haven't experienced too much rot in newly planted irises in the fall year of their planting, seems I get more of that in the spring if we have a lot of freeze and thaw weather. If they were all mixed up with other vendor's plants, and the others were OK, that would be a different story. 
I do think that some irises are more susceptible to rot then others.
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