HYB: backcrosses, etc...

Okay, so I'm new (sue me)... I'm still a bit confused and learning...
I was curious about my recent limited number of searches of TB iris 
pedigrees. In the few I've searched, I haven't seen anyone that has 
backcrossed an older variety to a more recently developed iris (yet).
I know that it's done, I guess I must be missing something.
I know, from experience with tropical fishes and cockatiels that 
backcrosses to older colorations can be essential but can cause 
setbacks.But knowing of the potential setbacks, one can mostly avoid 
them through careful selection of parent stock. Are the newer 
developed TB's that much better or is it that the drawbacks of a 
backcross are more damaging than good. Ms. Sharon McCallister has a 
lot of good info on her website regarding hybridizing. I'm just 
curious as to more about the "good" or "bad" experiences encountered 
by hybridizers concerning using "historics" or "old stock" iris to 
enhance or somehow better the new. I don't want to jump into the iris 
hybridizing game totally blind. :) 
Are there any publications or other online sources I can turn that 
may already have more info available? :)
Thanks to all for your continued assistance.... 
Steve Mahlberg zone 4b Duluth, Minnesota



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