cultivars and disease

I hope we won't be too quick to label cultivars as disease prone.  I don't
doubt that there's a genetic component to most diseases, but many other
variables are involved in the actual contracting of the disease.  Nutrition,
watering, soil, garden location and luck are all possible contributors.  I
have found that irises in a certain part of my garden may have more disease--
a fact that seems to rule out genetics as a factor.  

I hate to hear a cultivar,or worse the total work of a hybridizer, maligned
because someone's iris died.  I don't hesitate to replace lost plants of
appealing varities and it almost always grows well the next time.

Cures for rot:  In my experience, there's no substitute for keeping a close
eye on your plants and physically eliminating the infected area early on.
 I'm told also that Agrimycin is effective on bacterial rot.  Bacterial rot,
by the way occurs in warm weather, is slimy and yellowish brown and stinks.
 Botrytis is grey, grainy and appears in cooler weather.
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