I had a lot of yellow streaked leaves on my daylilies this year (had more daylilies this year) and I thought it was all leaf streak. But I started pulling the yellow leaves and the ones with the most leafminer damage. Now as the season has progressed it seems that at least some of the yellow streaked leaves might have just been naturally aging leaves. I pull a hand full and sometimes two, when I go to the garden every morning while I am dead heading. I notice that some varieties are much worse in showing the broad yellow streaks in the leaves ( Flore Pleno and Baja) are two that I seem to pull the most yellow leaves off of (once again I have more of these than any other plants also).
Early in the season I was very concerned about pulling so many leaves off the plants, but they seem to have responded well and I have not sprayed this year. Now it seems I go through longer periods without having to pull so many leaves.
