There are other small brown pupae in the ground that look similar but aren't borers. I don't know if they belong to a helpful insect or if you should just get rid of all of them. I am having a real problem with leaf rot starting at the base of leaves and I don't know if it is borer related or not. By the way, there is an interesting article with pictures about iris borers that I just "dug up". Not sure how I can share the thread here.
