I have a daylily right now that is having the same problem (minus the Chlorosis). Most of my daylilies are in pots and this is no exception. On this particular daylily, it was (a) a new plant this spring (b) had already lost one fan to crown rot (c) has not been a vigorous grower. We have had an exceptional amount of rain for our area this August, and I think that on this plant the roots have just not grown enough to absorb all that water. When you have wilting foliage when there is adequate moisture available to the plant, almost invariably it is a root problem. Chlorosis can be another symptom of too much water. Because mine is in a pot it was easy for me to move it underneath the porch to make sure that no additional moisture reaches it. If you wish to go to the bother, you can dig yours up (what a dandy way to get a good view of the roots!), pot it up in an excellent draining potting mix and see if it pulls out of this funk before crown rot does set in............Maryl
