I hope to use this thread for all daylily growers to post pictures of their daylily foliage (healthy examples and unhealthy ones) and the cause of the problem or have others look at the photos and determine the cause of the problems. I would love for this to become a reference site with lots of photos and info. I am often confused over what is normal aging and what is an actual disease. I normally don't show the plants with bad leaves, but pull them instead before taking a photo but now I will try to show them both ways. Off to take new photos.

Had a lot to do today, and then had more rain, so my photo taking was delayed a little while. I just went out into the garden and took a photo of a distressed leaf and a photo of the entire plant. Look at them and suggest what you think might have caused the problem. I will state what I think it might be and hopefully sooner or later we can come to a consensus and then post the photos with the correct diagnosis.
1. Leaf
1. Entire plant

2. Leaf
2. Entire plant

3. Leaf
3. Entire plant

4. Leaf
4. Entire plant

5. Leaf
5. Entire plant
Now something I noticed that I was aware of but did not realize the extent of is the leaf miner problem, I think almost every daylily I have from last year and most of the new ones this year are showing leaf miner damage.
The first photo I think, shows leaf streak combined with physical damage caused by either me or some critter contacting the leaf and bending it.
The second photo I think, shows definite leaf miner damage and I think just an aging leaf? Could be leaf streak.
I do think almost every daylily I have is showing problems with leaf streak.
The third photo I think show leaf minor and leaf streak again, but the leaf streak does not look nearly as pronounced as on some of the leaves, so I don't know for sure.
Photo four, well once again leaf miner damage, some leaf streak, and some aging of the leaves?
Finally, photo number five to me looks like a classic example of leaf streak.

#5 looks to me like some leaf miner also. I got a chance to see what it looks like when my garden inspector pointed it out to me. They leave trails in the leaf.

Definitely leaf miner damage, I guess I had repeated that so often I forgot to mention it again. What did your garden inspector say to do for it...pull the leaves?

No, he said there was currently no treatment for it but I think pulling the leaves sounds sensible to me.