Has it been particularly rainy where you are? They can get a fungal disease (leaf streak) from the soil, particularly in wet soil. It usually doesn't kill them. Pluck off the yucky leaves and discard (do not add to compost.) If it continues you may want to spray with Dacinol or another fungicide.

This post was edited by booberry85 on Sun, Jun 30, 13 at 13:41

Looks just like mine, and I did spray with Clearys, but too much rain to overcome. (a good thing for the blooms though)

kay

Hmm, of all the plant species I have its amazing that daylily is the one with a potential issue.

I pulled off several fans so far (not sure why I said scapes above). Do you try to full it off at the base?

Its been above average for rain but nothing extrodiary. I have very well drained soil and these plants are in full all day sun. All three have the same issue.

Thanks for the info!

It looks like slimy slug damage to me. Or a fungal infection going along the slug slides.

Debra

I think its too sunny, open and dry for this area to have slugs.

I googled leaf streak and there are several photos that look just like my plants.