Daylily Rust Information Page
Daylily rust on daylily
Image
by Susan Bergeron
Daylily rust
on Patrinia villosa
in Japan.
Image
by Dr. Y. Ono
Introduction
Daylily rust is caused by the fungus Puccinia hemerocallidis. It is not a new disease of daylilies, having been reported previously from China, Taiwan, Korea, Japan and Russia (Sakhalin, Kuriles and Siberia). There is a record of daylily rust specimens having been collected in Siberia, Russia, as long ago as 1878. Unfortunately, the disease is now also in North America, having first been identified in the south-eastern United States in August 2000. While it was initially spread to many other areas on shipped plants, the main method of rust spread in nature is by wind blown spores.
Daylily rust so far appears to have successfully overwintered in the warmer areas of the United States to USDA Zone 7. It apparently does not persist in all infected Zone 7 gardens however, therefore it is hoped that rust will not be a significant problem in colder zones unless, perhaps, it can utilize the alternate host, Patrinia, as it does in Asia (while there are many different plant rusts affecting many different plants, only Hemerocallis and Patrinia are susceptible to daylily rust).
It is conceivable that daylily rust could persist in some colder areas than one would otherwise expect where there is a protective covering of deep and continuous snow throughout the winter, or perhaps under a heavy winter mulch, or in close proximity to a warm house wall. Of course, it may also persist in greenhouses. In the current absence of researched information it would be prudent to assume that daylily rust could potentially overwinter anywhere that at least some infected daylily foliage remains green through winter even if Patrinia is not present.
Daylily Rust in its Native Regions
- Daylily Rust in China
- Daylily Rust in Japan - images
- Hosts of Puccinia hemerocallidis in its Native Regions
Daylily Rust Biology
- Daylily Rust Lifecycle
- Life Cycle Images (including infected Patrinia)
- Diagram of Rust Development
- Animation of Asexual Rust Cycle
- Animation of Complete Rust Life Cycle
- Spore
Longevity, Latent Period, Winter Survival
Images of Daylily Rust
Images of Non-Rust Leaf Problems
Reducing the Risk
Daylily Rust Research
Daylily Rust Survey
- Daylily Rust Survey (External link - currently unavailable)
Links to Other Relevant Web Sites
© Susan Bergeron, this page last updated 17th November, 2012.
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