Daylily Rust Information Page

Daylily Rust Information Page

Information on This Site

Introduction
Daylily Rust in its Native Regions
Daylily Rust Biology
Images of Daylily Rust
Images of Non-Rust Leaf Problems
Reducing the Risk
Daylily Rust Research

Close-up of rust on underside

of daylily leaf

Image by Susan Bergeron

 

Links to Other Relevant Sites

Web Pages About Daylily Rust
Images of Patrinia    
Rust Diseases of Plants in General
Fungicides
Understanding Plant Problems
Breeding for Disease Resistance
Daylily Rust Survey

Rust on Patrinia villosa in Japan

Image by Dr. Y. Ono

(See Life Cycle Images page)

 

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, in 1878. Unfortunately, the disease has now arrived in North America, and was first identified in the south-eastern United States in August 2000. Because of widespread shipping of infected plants, by late 2001 daylily rust had been identified in approximately 30 US States, Canada and Australia, however it did not necessarily persist through the subsequent winter in all of these areas. In nature, the main method of rust spread is by wind blown spores.

How this disease will affect daylilies continent wide is not yet known because it hasn't been present here for a sufficient length of time. Daylily rust so far appears to have successfully overwintered in the warmer areas of the United States to USDA Zone 7.  It apparently did 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.  Some people are also concerned that daylily rust could persist in areas where there is a protective covering of deep and continuous snow throughout the winter, or perhaps under a heavy winter mulch. Research is continuing into the biology and winter survival of this disease.

Visit the pages and links below for information and images. This web site is updated frequently, so you may wish to bookmark it for future reference. Please note that although links to other web pages are selected with care, this site is has no control over the content of those external links and all web pages are subject to change.

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Daylily Rust in its Native Regions

Daylily Rust Biology

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Images of Daylily Rust

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Images of Non-Rust Leaf Problems

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Reducing the Risk

Daylily Rust Research

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Other Web Pages About Daylily Rust

PLEASE  NOTE - MANY OF THE EXTERNAL LINKS BELOW NO LONGER WORK DUE TO TO CHANGES IN WEB ADDRESSES OR PAGE REMOVAL. THESE LINKS WILL BE UPDATED AS SOON AS I AM ABLE TO TRACK DOWN THEIR NEW ADDRESSES OR VERIFY WHICH PAGES NO LONGER EXIST AT ALL.  MY APOLOGIES FOR ANY INCONVENIENCE UNTIL THIS IS COMPLETED.

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Images of Patrinia, the alternate host 

Rust Diseases of Plants in General

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Fungicides

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Understanding Plant Problems

Breeding for Disease Resistance

Daylily Rust Survey

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Photo credits: All rust images on this page except where otherwise specified are by Jay Laundre except for the "Tissue Test" and Daylily Leaf with Rust - Image 6 which are by Jennifer Jackson, and Early Daylily Rust and Early Daylily Rust - Check Undersides of Leaves which are by Jennifer Llewellyn. All non-rust images (except for Not Rust Image 3 by Jay Laundre, and the first image of leaf streak) and rust image No. 7 are by Susan Bergeron except where specified otherwise.

© Susan Bergeron, this page last updated 26th June 2008
Please report any problems with this page to:
send email to daylilyss at yahoo.ca