Daylilies forum: Daylily rust?

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zone 5 - northern Illinois
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ninabee
Aug 11, 2017 9:23 AM CST
Something is very wrong with my day lilies. The leaves turned a rusty brown color and they all started dying at a rapid pace. Did some research and it seems that it's leaf rust... Read that I should cut them all down, so I did that. Gave me a better look at how bad the rust is. It's spread far down on the leaf to the crown. I was planning on splitting them this fall. Should I not? I've attached pictures to show how bad it is.
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Name: Pat Strong
Stone Mountain (Zone 8a)
Region: Georgia Dragonflies Ponds Cut Flowers Dahlias Birds
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Pat236
Aug 11, 2017 10:53 AM CST
This does not look like rust to me. I have included a link to a discussion from this site regarding rust. Hope this helps to eliminate rust from the possibilities. Rust spores are reddish brown spores that will rub off in your hand when touched.
The thread "I think I have rust." in Daylilies forum
Pat236
[Last edited by Pat236 - Aug 11, 2017 10:54 AM (+)]
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zone 5 - northern Illinois
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ninabee
Aug 11, 2017 10:58 AM CST
Well, I wasn't 100% sure it was rust cause there wasn't any pustules. But I didn't find any other problem that resulted in brown, dying leaves. Anyone know what's killing my leaves?
Name: Sue
Ontario, Canada (Zone 4a)
Daylilies Birds Enjoys or suffers cold winters Native Plants and Wildflowers Butterflies Annuals
Region: Canadian Keeps Horses Dog Lover Plant Identifier Garden Sages
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sooby
Aug 11, 2017 11:19 AM CST
There is a duplicate thread for this in Ask a Question and I answered there before seeing it here. It is not daylily rust. It could be leaf streak. Also daylilies tend to die back somewhat after flowering, but I assume this is new this year? There is thrips injury on the leaves in your pictures, and that could let the leaf streak fungus infect the plants. But a lot of people cut back their daylilies after flowering so that they regrow clean foliage. I wouldn't do it with a newly planted daylily or one that's winter hardiness is uncertain. There are pictures of leaf streak here:

http://www.daylilies.org/ahs_d...
Name: Valerie
Ontario, Canada (Zone 4a)
Daylilies Irises Roses Peonies Butterflies Birds
Bee Lover Region: Canadian Ponds Garden Art Dog Lover Enjoys or suffers cold winters
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touchofsky
Aug 11, 2017 11:22 AM CST
@sooby
What is the thrip injury in these photos?
I don't know how to recognize thrip damage.
[Last edited by touchofsky - Aug 11, 2017 11:23 AM (+)]
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Name: Sue
Ontario, Canada (Zone 4a)
Daylilies Birds Enjoys or suffers cold winters Native Plants and Wildflowers Butterflies Annuals
Region: Canadian Keeps Horses Dog Lover Plant Identifier Garden Sages
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sooby
Aug 11, 2017 11:43 AM CST
touchofsky said:@sooby
What is the thrip injury in these photos?
I don't know how to recognize thrip damage.


This picture is not high resolution, it was taken years ago with my first digital camera, but I think it shows it well enough. The top leaf shows thrips injury, the lower one is spider mite damage. The thrips damage is more "streaky" than the stippling/speckling of the spider mites. The brown spots are most likely the leaf streak fungus taking advantage of the damage.

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Name: Valerie
Ontario, Canada (Zone 4a)
Daylilies Irises Roses Peonies Butterflies Birds
Bee Lover Region: Canadian Ponds Garden Art Dog Lover Enjoys or suffers cold winters
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touchofsky
Aug 11, 2017 12:22 PM CST
Thanks, Sue. The picture shows the difference very clearly.
zone 5 - northern Illinois
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ninabee
Aug 11, 2017 3:02 PM CST
These lilies were here when we moved in. So they are definitely established. This is the first time I've seen this. Whatever it is it's spreading to the neighboring lilies. Even to the one on the opposite side of my garden. It very well may be leaf streak. Here's another plant that I have to cut down. Is there something i can do to treat the crown once all is cut? Thank You!
Thumb of 2017-08-11/ninabee/df5b2a

Name: Sue
Ontario, Canada (Zone 4a)
Daylilies Birds Enjoys or suffers cold winters Native Plants and Wildflowers Butterflies Annuals
Region: Canadian Keeps Horses Dog Lover Plant Identifier Garden Sages
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sooby
Aug 11, 2017 3:10 PM CST
That looks more typical of leaf streak, with the yellow and brown down the midrib. I have never seen it suggested to treat the crown, but you can clean up the leaves and remove them at the end of the season to try and reduce overwintering. There are fungicides that will give some control, if it bothers you that's a possibility for next year. There is a research article that indicates which fungicides worked best in trials on the AHS page I linked to above.
zone 5 - northern Illinois
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ninabee
Aug 11, 2017 7:16 PM CST
Well, originally I thought it was rust and everything said to cut the plant down to the crown and so that's what I did. That's why I asked if I could treat the crown since that's all that's left. I will leave it be for now and hope they grow back healthy. Although, I might have killed them since I cut them down earlier than normal. I'll just have to wait and see.
Name: Sue
Ontario, Canada (Zone 4a)
Daylilies Birds Enjoys or suffers cold winters Native Plants and Wildflowers Butterflies Annuals
Region: Canadian Keeps Horses Dog Lover Plant Identifier Garden Sages
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sooby
Aug 11, 2017 7:22 PM CST
Have you cut them back further than the top picture? If not, they're not down to the crown and they should grow back fine.
Name: Amber
Missouri (Zone 6a)
Daylilies Region: Missouri Garden Photography
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amberjewel
Aug 11, 2017 10:06 PM CST
@sooby If left untreated, can leaf streak kill a daylily? Or is it more of a nuisance because of how unsightly it is? Is it like rust in that the spores that cause it will die out in colder winter climates?
Amber
Daylily Novice
Name: Sue
Ontario, Canada (Zone 4a)
Daylilies Birds Enjoys or suffers cold winters Native Plants and Wildflowers Butterflies Annuals
Region: Canadian Keeps Horses Dog Lover Plant Identifier Garden Sages
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sooby
Aug 12, 2017 4:49 AM CST
I've never heart of it actually killing a daylily but if it kills a lot of leaves it could theoretically weaken them if they're not particularly robust. Like daylily rust, cultivars vary in their resistance/susceptibility to leaf streak. It is said to need an injury, such as pest or weather damage, to infect a plant so differs from daylily rust in that respect.

No, cold winter climates don't kill it unfortunately. What kills rust in cold winter climates is that the leaves die back and the mycelium (the body of the fungus) in the leaf cannot survive winter without living foliage. It can, however, use the "winter spores" to infect the alternate host, patrinia, in the spring where that plant is present. The "winter spores" of daylily rust do survive very severe winter climates (it was first recorded in Siberia) but can't re-infect daylilies, only patrinia, and then return to daylilies again.
zone 5 - northern Illinois
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ninabee
Aug 12, 2017 8:34 AM CST
@Sooby, unrelated question- where does all of your knowledge come from? You always have the most informative answers. You might be smarter than Google. Smiling
Name: Sue
Ontario, Canada (Zone 4a)
Daylilies Birds Enjoys or suffers cold winters Native Plants and Wildflowers Butterflies Annuals
Region: Canadian Keeps Horses Dog Lover Plant Identifier Garden Sages
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sooby
Aug 12, 2017 9:43 AM CST
Well I do wonder about Google sometimes Hilarious! I wrote or co-wrote most of the pest and disease entries for the AHS Daylily Dictionary, and the daylily rust info web site is mine: http://web.ncf.ca/ah748/rust.h...
Name: Larry
Enterprise, Al. 36330 (Zone 8b)
Composter Garden Photography Million Pollinator Garden Challenge Garden Ideas: Master Level Plant Identifier Celebrating Gardening: 2015
Region: Alabama
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Seedfork
Aug 12, 2017 11:23 AM CST
I don't think any of us appreciate enough all the info sooby provides us with!
Name: Sue
Ontario, Canada (Zone 4a)
Daylilies Birds Enjoys or suffers cold winters Native Plants and Wildflowers Butterflies Annuals
Region: Canadian Keeps Horses Dog Lover Plant Identifier Garden Sages
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sooby
Aug 12, 2017 12:01 PM CST
*Blush* Thank You!
Name: Valerie
Ontario, Canada (Zone 4a)
Daylilies Irises Roses Peonies Butterflies Birds
Bee Lover Region: Canadian Ponds Garden Art Dog Lover Enjoys or suffers cold winters
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touchofsky
Aug 12, 2017 3:38 PM CST
Thank You! Sue!

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