I had read in 2001 a very good, although short, article by the Late Richard Ernst of the famed Cooley's Gardens of Silverton, OR. The article was published in the
AIS Bulletin in July of that year. At that time I was plagued with rot problems, especially the kind illustrated in Sherry's pictures above. According to Rick (and others) this disease carries several names, but they are all IMHO the same pathogen. Crown Rot, Southern Blight, Mustard Seed Fungus, etc. etc.
It is titled 'More on Iris Culture' and appears on page 22 in that issue. Also it is in PDF format. Although brief, the points he made have helped me a lot over the years. This is the link if you care to take a peek:
https://archive.org/stream/bul...
