I am having a major leaf spot out break. Very frustrating. The early signs made me think Iris borer; and I was kinda expecting a possible borer issue. So I treated for borer with the correct Bayer grub application. What I thought were the early signs of borer were in fact Leaf Spot. I have sprayed anti fungal treatments on them, but I am way behind the curve. Looks like I will have a crappy looking group of plants this season. Will continue to spray, but will have to "chop" the heck out of the fans in the Fall and spraying early next year.
Only one plant so far has been adversely affected by this infection and that is a NoID iris. Some areas are a bit too crowded which I will also attend to in the Fall.
