Have a look at

Here is a link that might be useful: Iris diseases

I have read about leafrollers now...hummm seems they could be controlled with some Praying Mantis'or birds...They sound like they would be a yummy snack for a bird or Praying Mantis..

Put a couple bird feeders near your cannas.

Ok, thanks. I checked out that link. Still not sure what mine are suffering from, but it is an interesting link anyway. Thanks for the suggestions.