Daylilies forum: Is This Rust?

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Name: Nancy
Downers Grove, IL (Zone 5b)
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nancyindg
Sep 23, 2020 2:06 PM CST
I'm in zone 5b, Chicago area. I have an isolated section of mostly 2nd year and some newly planted daylilies that have developed yellowing leaves that has me wondering if they have been afflicted with rust. Other daylilies in other sections of the yard aren't exhibiting this problem. I can't recall if this also happened at this time last year because I undoubtedly wasn't paying attention. We did have a few months of a drought, which was broken a couple of weeks ago with a lot of rain. Mike and Tim, are you also getting this?
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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
Sep 23, 2020 2:28 PM CST
It does look as if the spots are raised, in which case it is likely daylily rust. It should not survive the winter in your zone, presumably it came in on new plants.
Name: Nancy
Downers Grove, IL (Zone 5b)
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nancyindg
Sep 23, 2020 2:53 PM CST
I should correct my original post to say that another bed of daylilies does have a similar leaf problem but it's not to the same extent (yet) as the bed where the photos were taken.
Name: Mike
Hazel Crest, IL (Zone 5b)
"Have no patience for bare ground"
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Hazelcrestmikeb
Sep 23, 2020 3:37 PM CST
Nancy some of my new plants in pots are showing the same.
Like Sue said, it will be killed with our winter temps. I would not worry about it. Just send the foliage off to the local compost.
robinseeds.com
"Life as short as it is, is amazing, isn't it. MichaelBurton
"Be your best you". "Mikedon" on the LA.
Name: Roger & Karen
Birmingham, Al (Zone 7a)
Daylilies Plant and/or Seed Trader Region: Alabama Butterflies Enjoys or suffers hot summers Seed Starter
Hummingbirder Critters Allowed
Diggerofdirt
Sep 23, 2020 3:44 PM CST
If its rust you can run some foliage between your index finger amd thumb and if comes off on fingers rusty color its rust.
Every home needs a daylily, and every daylily needs a home.
Name: Tim
West Chicago, IL (Zone 5a)
Daylilies Native Plants and Wildflowers Vegetable Grower
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Lyshack
Sep 23, 2020 3:52 PM CST
I've had that when I was newer and buying more plants on the LA. I've learned to only buy from Southern growers in the fall so our winter can kill anything hitching a ride here.

I'm glad Sue did the first reply, because I'm definitely not the rust expert. I think I've read it can spread from plant to plant in the wind. So you mentioned a second bed that had an issue. Maybe it also was contaminated by a plant bought from the south or from a big box store that might be shipping them from the south. Or it could be that prevailing winds or a lawnmower might have blown spores from the worse bed over to the other bed.

Even a mild winter by our standards should kill it.
McLean, VA (Zone 6b)
daylilly99
Sep 23, 2020 5:57 PM CST
It's hard to tell for sure without seeing it in person but it does look like rust. I'm rust free this yeat but have had that problem here too many times to count. I can almost always trace it to a plant brought in that year from somewhere further south. Luckily, winters do always kill it here (so far).

For sure bag all the foliage and don't compost it. I usually go mental and cut it back and spray with something to try to stop it but by the time you see it on one plant, it's pretty much a waste of time ... especially if you have a kitty who follows you and goes through all the daylily foliage all the time. Squirrels and other animals may spread it also, in addition to the wind.

Our very knowledgeable Jim Murphy of Woodhenge Gardens says he cuts all newly received plants right down to almost the crown and soaks them in Daconil for some amount of time and never gets rust. (Second hand information, so I'm a bit sketchy on the exact details). New daylilies are so expensive, I just couldn't bear to take the risk of killing them by doing that.

In any case, I'm sorry if you do have rust this year. I hate it with a passion. Just remember winter will take care of it but do practice the good hygiene.
Name: Ian McBeth
Lincoln NE (Zone 5b)
Horticulture, Photography, & Art
Plant Lover: Loves 'em all! Amaryllis Irises Daylilies Lilies Foliage Fan
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SonoveShakespeare
Sep 23, 2020 7:08 PM CST
If it's rust, cut down the foliage. It should slow down the rust process and to prevent the disease from reaching other daylilies. Also CAREFULLY dispose the leaves once you cut them(not in the compost). I dump mine in the vegetable garden, along with grass clippings. They make great use as a natural ground cover/adds nutrients into your garden soil.

Unless you already have daylilies in your vegetable garden, find another place in the yard that doesn't have daylilies.
Not only people give others signs, but plants do too.
[Last edited by SonoveShakespeare - Sep 23, 2020 7:10 PM (+)]
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Name: Nancy
Downers Grove, IL (Zone 5b)
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nancyindg
Sep 23, 2020 8:04 PM CST
Thank you everyone for the sage advice. Mike and Tim, I know I put you on the spot and I appreciate your input. I have about 12 new daylilies that were shipped bare rooted and have been getting TLC in pots (including a bunch from Pat!) and it's going to pain me to plant them where there's rust, but I'm running out of time and I guess they'll have to take their chances. I did already plant some of the more advanced newbies and at the moment they are okay. I'm fleeing the midwest for FL in about a month but I guess it's good for the daylilies that they will soon be freezing their little butts off.
Name: Mike
Hazel Crest, IL (Zone 5b)
"Have no patience for bare ground"
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Hazelcrestmikeb
Sep 25, 2020 7:29 AM CST
Fleeing the Midwest ! Go ahead and leave Tom, Steve and I among others to freeze Rolling on the floor laughing Rolling on the floor laughing Rolling on the floor laughing with the plants.
robinseeds.com
"Life as short as it is, is amazing, isn't it. MichaelBurton
"Be your best you". "Mikedon" on the LA.
Athens, Ohio (Zone 6a)
mantisOH
Sep 27, 2020 7:50 PM CST
Definitely rust. Must have been imported on new purchases.

Witan
Sep 29, 2020 7:48 PM CST
Hello,
I'm new here. Have had some daylilies for almost a decade from Flourishing, never a problem. Just bought some new ones from LA and one is showing what I think is rust.
Sorry, picture did not transfer. These are yellow (like scale, only yellow) mostly on underneath of leaves. Can I trim off affected leaves? I have already moved these away from others. (Potted until I am allowed to dig in the yard)
Is rust similar to a virus that invades the plant's system? With orchids (grown for 40+ years), virused plants are disposed of, not allowed in shows, etc.
Thank you.








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
Image
sooby
Sep 30, 2020 4:02 AM CST
If you could get the picture to upload it would be helpful, I wouldn't say that daylily rust looked like scale exactly. Can you wipe orangey-yellow powder off the spots? See also "how can I tell if my daylilies have rust" here:

http://web.ncf.ca/ah748/FAQ.ht...

What to do about it would depend on your climate, do you know your hardiness zone?

No it is only like a virus in the sense that it needs living daylily tissue in which to live and reproduce, but it is not systemic. It is contagious so would be frowned upon if you took a visible rust infection to a show.

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