| Hi Veryzer, There are two possibilities. 1.) Mosaic Virus, although typically Mosaic virus symptoms usually are streaks of yellow, and not spots. The only cure for mosaic virus to complete burn and destroy the plant. 2.) Round-Up/Weed-Killer Damage, has also been known to cause spots like that. There was a small discussion about a similar problem several years ago: Yellow Spots on Iris, but the photo of it has since been removed. I do have a couple of Iris with this trait now, although in the past, I have simply left it alone and it seems to do fine. Good luck,
Carlos | 
