P&PDL Picture of the Week for
April 4, 2005

Daylily Leaf Streak---An Ounce of Prevention is Worth a Pound of Cure

Gail Ruhl, Senior Plant Disease Diagnostician, Interim P&PDL Director, Department of Botany & Plant Pathology, Purdue University

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 toreduce 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.

Photos courtesy of Karen Rane, Purdue University


Click on image to enlarge

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.


Purdue Plant & Pest Diagnostic Lab Purdue Cooperative Extension Service