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March 27, 2023
Daylily Leaf Streak---An Ounce of Prevention is Worth a Pound of Cure
Gail Ruhl, Plant Disease Diagnostician-retired
Daylilies are one of the most popular perennials grown in the United States. They are pretty, easy to grow and relatively low-maintenance. However, there are several different fungal diseases that attack the foliage of daylily and if you did not remove the infected, dead, foliage last fall, fungal spores likely survived the winter in the dead leaves and stems at the base of the plant and will likely infect the new growth that emerges in the spring. It is not too late to reduce the chance of re-infection from pesky fungal diseases such as daylily leaf streak. Go outside NOW and remove last year's leaves and stems from around the base of your daylilies. Your reward for good garden sanitation will be healthier, 'happier' daylilies.
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Improper Garden Sanitation
Daylilies emerge in the spring through infected plant material that was not removed last fall. 
Spring Clean-Up-It’s Still Not Too Late!
Dead plant material can still be removed from around newly emerging plants to reduce the chance of infection. Thorough removal and destruction of last year’s leaves and plant debris from the planting site is recommended for best results. Keep up with current landscape issues by subscribing to the Purdue Landscape Report and learn to diagnose common landscape problems using Purdue Plant Doctor.
See these other articles for more information.
Plan Now for Garden and Flower Bed Sanitation 
Foliar Nematodes 