This is my first post so bear with me if I do something wrong. I have a couple of beautiful daylillies just outside of my front door that work perfectly where they are. They are both doing very well this year but I just noticed that the first two or three inches of the mature leaves have turned white. There are no pest signs and the plants look healthy in all other respects and the two plants are not the same cultivar. I don't recall ever seeing this before. Does anybody have any ideas that can help me?