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Avatar for Juliefredg
May 22, 2020 7:45 PM CST

My day lilies are infected with leaf streak. I have never had this before. should I cut the lilies to the crown, spray with a fungicide and let them regrow?
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May 23, 2020 9:56 AM CST
Name: Sue
Ontario, Canada (Zone 4b)
Annuals Native Plants and Wildflowers Keeps Horses Dog Lover Daylilies Region: Canadian
Butterflies Birds Enjoys or suffers cold winters Garden Sages Plant Identifier
Welcome!

If it's definitely leaf streak, there's some information, including a link to fungicide research, from the American Hemerocallis Society here:

https://daylilies.org/daylily-...

I don't think I would cut them as drastically to the crown though. Did they get frosted?
Avatar for carlanh
Aug 1, 2021 10:17 AM CST
Name: Carla Roselli

After spending 3 days last fall removing diseased plants, removing dead leaves, and spraying with a fungicide and repeating the spraying when they began to break ground this spring, it began to rain and rain and rain. And the heat and humidity were very high for most of late June and almost all of July. Leaf streak came back with a vengeance and I'm about to give up and pull them all out. Any suggestions?
Thumb of 2021-08-01/carlanh/353d65


Thumb of 2021-08-01/carlanh/f1491f
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Aug 2, 2021 10:14 PM CST
Name: Zoia Bologovsky
Stoneham MA (Zone 6a)
Bee Lover Birds Butterflies Cat Lover Daylilies Region: Massachusetts
Enjoys or suffers cold winters
Uh…don't stress out about it? Mine get some leaf streak every year, especially as the season continues, but the Daylilies come back the following year and do fine. Just pull the dead leaves off, so they look better and maybe plant things that will hide the foliage when it gets ratty, like phlox or black eyed Susan's that start to flower in August.
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Aug 3, 2021 5:30 AM CST
Name: Larry
Enterprise, Al. 36330 (Zone 8b)
Composter Daylilies Garden Photography Million Pollinator Garden Challenge Garden Ideas: Master Level Plant Identifier
Celebrating Gardening: 2015 Region: Alabama
@carlanh,
Maybe try a different fungicide, or at least rotate with another one. Also spray on a 14 day schedule. I know trying to find time in-between showers to spray this year was almost impossible, but we have not had many years as wet as this one in a long time. So maybe most years will not be provide such great conditions for leafstreak.
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Aug 3, 2021 5:44 PM CST
Name: Justine
Maryville, Tennessee (Zone 7a)
Hybridizer Cat Lover Birds Daylilies Tropicals Farmer
Apples Peonies Irises Lilies Deer Greenhouse
I have heard Cleary's 3336 being suggested for leaf streak. This article is a bit old (2002?) but suggests that and Systhane for management of the fungus: Day_Lily_article_MDFGA_2002.pdf (I don't know how to make this link active. Sorry!) The other fungicides tried were ineffective at managing the virus. (I see they erected an electrified deer fence around the test plot of daylilies. Smart researchers with resources!)
I wonder why no one ever told me
that the rainbow and the treasure
were both within me. -- Gerald G. Jampolsky, M.D.
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Aug 3, 2021 5:58 PM CST
Name: Sue
Ontario, Canada (Zone 4b)
Annuals Native Plants and Wildflowers Keeps Horses Dog Lover Daylilies Region: Canadian
Butterflies Birds Enjoys or suffers cold winters Garden Sages Plant Identifier
Hembrain said:I have heard Cleary's 3336 being suggested for leaf streak. This article is a bit old (2002?) but suggests that and Systhane for management of the fungus: Day_Lily_article_MDFGA_2002.pdf (I don't know how to make this link active. Sorry!)


I think you probably mean the second PDF, at the bottom of this page on leaf streak:

https://daylilies.org/daylily-...
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Aug 4, 2021 7:48 AM CST
Name: Justine
Maryville, Tennessee (Zone 7a)
Hybridizer Cat Lover Birds Daylilies Tropicals Farmer
Apples Peonies Irises Lilies Deer Greenhouse
Thank you Sue! I was hoping a technologically adept person would come to my rescue. Not expecting that I would get functional redundancy! D'Oh! Rolling on the floor laughing Didn't get that far on the page. Like so many others I was skimming. Lazy? Busy? It's pod season, so the latter this time. I saw the study via a search to check out the Cleary's recommendation my mentor had given me a few years ago.
I wonder why no one ever told me
that the rainbow and the treasure
were both within me. -- Gerald G. Jampolsky, M.D.
Image
Aug 4, 2021 9:17 AM CST
Name: Orion
Boston, MA (Zone 6b)
Bee Lover Birds Butterflies Daylilies Dragonflies Foliage Fan
Lilies Lover of wildlife (Raccoon badge)
Shame about the price of the top 2 that worked. Sighing!
The cheapest Cleary bottle was over $50, that I found. Crying
I think I can live with leaf-streak at those prices. Thinking
Gardening: So exciting I wet my plants!
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