Daylilies forum: Leafminer

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Name: Sue Petruske
Wisconsin (Zone 5a)
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petruske
Jul 25, 2017 8:49 PM CST
I've noticed a leafminer problem on this daylily (Mighty Highty Tighty). Would you recommend pulling it up and giving it a bleach solution treatment. I actually need to move it to a spot where it will get more sun anyway. I just got it last year from a very reputable DL grower. I've had the leafminer before, but just a very minor problem, NEVER to this extent. So I don't know if it came with the plant or if this particular DL is more susceptible. I looked at last years picture of it and there was signs of it then, just didn't notice. Some of the DL's around this DL are also affected but not nearly as much. If I look around the gardens I will find a hint of the leafminer tracks a little bit but not much. Should I be concerned or will next year "possibly" be better? We did have a lot of rain this year. Maybe contributed to the issue????

Thumb of 2017-07-26/petruske/9e6a6d
Name: Judy
Louisiana (Zone 9b)
Region: Louisiana Daylilies Tropicals Region: Gulf Coast Hybridizer Seller of Garden Stuff
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judydu2
Jul 26, 2017 2:36 AM CST
I'm not so sure what you are seeing is leaf miner tracks. The lines are very straight, which could suggest something else may be causing your damage.

Random photos from the internet of daylily leaf miner tracks:

Thumb of 2017-07-26/judydu2/66c363

Thumb of 2017-07-26/judydu2/5bc527

http://www.daylilies.org/ahs_d...

http://blogs.mcall.com/master_...

[Last edited by judydu2 - Jul 26, 2017 7:36 AM (+)]
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Name: Sue
Ontario, Canada (Zone 4a)
Daylilies Birds Enjoys or suffers cold winters Native Plants and Wildflowers Butterflies Annuals
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sooby
Jul 26, 2017 3:10 AM CST
I agree with Judy, I don't think it is leafminer, the lines are too straight and look more like open grooves rather than something between the upper and lower epidermis. I've seen something like that here, and in photos from other gardens, but I've never managed to catch the culprit.

Digging up and dunking in bleach is going to hurt the plant more than a pest. If it was leafminer, which I'm pretty sure it is not, they are protected within the the leaf from external treatments that are not systemic in any case. If you're moving it regardless you'll be cutting back the leaves and if the pest has already moved on, the new growth should be OK. Have you seen any small beetles or tiny slugs/snails?
Name: Elena
NYC (Zone 7a)
Daylilies Plant and/or Seed Trader Winter Sowing Hybridizer Peonies Vegetable Grower
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bxncbx
Jul 26, 2017 3:54 AM CST
Sue, I saw the same thing on Comic Strip earlier this year. It's in a black nursery pot and just looked awful. I assumed the swampy Spring we had was the culprit. It has since recovered and bloomed without me doing anything except moving the pot to a sunnier location.
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
Jul 26, 2017 4:02 AM CST
If it is a pest that doesn't continually repeat generations throughout the growing season then at some point the damage will just stop happening although the leaves will not heal, of course. At the moment, on Sue's plant, it doesn't look enough to impair photosynthesis to any great extent so the plant can still function.
Name: Valerie
Ontario, Canada (Zone 4a)
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touchofsky
Jul 26, 2017 6:43 AM CST
I saw that a few years ago on a plant that I had just purchased. It was a clump when I purchased it. I suspected tiny snails/slugs that were down in the fans. That was just a hunch on my part. I did drench it with soap and water down into the fans, then rinsed it fully after 10 to 15 minutes, but that was all I did. After that first year, I didn't have a problem with that plant.
Name: Elena
NYC (Zone 7a)
Daylilies Plant and/or Seed Trader Winter Sowing Hybridizer Peonies Vegetable Grower
Seed Starter Organic Gardener Composter Container Gardener Spiders! Celebrating Gardening: 2015
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bxncbx
Jul 26, 2017 7:33 AM CST
I've had Comic Strip for years and it has never had a problem before. I attributed it to all the rain because it (like most of my other daylilies) had explosive growth in a very short period of time. The fans in that small pot probably doubled in size in about a month. Honestly, I thought of them as stretch marks. I had taller, thicker scapes this year also on almost all of my plants. They were also more prone to breakage (the entire scape, not just buds). The leaves seemed longer also.


Thumb of 2017-07-26/bxncbx/996436

Not a great photo but it shows the end result. The leaves started to tear along the lines. Not pretty but new leaves started coming up quickly to replace the damaged ones.

Edited to add photo & explanation.
[Last edited by bxncbx - Jul 26, 2017 7:42 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
Jul 26, 2017 8:08 AM CST
I don't think it's from rain, it's some kind of pest (although hail can shred leaves). I've seen it in dry years - which is the norm here but it's certainly not dry this year. If it is small slugs/snails they would be encouraged by damp conditions though. I've also wondered about leaf/flea beetles. If it was from rain we'd be seeing a lot of it around here this year!
Name: Sue Petruske
Wisconsin (Zone 5a)
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petruske
Jul 26, 2017 8:15 AM CST
Thank you ONE and ALL for the input. I'm glad to hear that you feel it may not be the leafminer. That's good news. I'll check around the base of the DL to see what I can see. Very possibly could be the unusual amount of rain we've had is causing it. I have even had a few of scapes on other DL's that bursted open because of the rain and growing too fast. Too much of a good thing.

My plan now, is to just leave it alone. Check the base for slugs, etc since it is in an area that could use more sun than it's getting. I'll make sure the mulch is pulled away from the base.

Thank you all again. I love this place where one can go to ask questions (late at night in your PJ's) and find help the next day. Group hug Hurray! Thank You!
Name: Sue Petruske
Wisconsin (Zone 5a)
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petruske
Jul 26, 2017 8:21 AM CST
We haven't had hail. I think the tree branches above it would have protected it from hail (somewhat). The DL's next to it have just a SLIGHT bit of the same problem. I'll check the ground area around all of them in that area and update if I find anything. There are hostas in the same area back under the tree. I'm going out right now to check it out.

Thanks again !!
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
Jul 26, 2017 8:32 AM CST
If it's slugs (or earwigs) you'd most likely see them at night (probably not a PJ job though Hilarious! )
Name: Sue Petruske
Wisconsin (Zone 5a)
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petruske
Jul 26, 2017 10:33 AM CST
I pulled the mulch away and "holy bugville". Besides the normal garden worm were these three critters.

Taken through a sandwich bag. Ballpoint pen to help with size of the bugs.

Thumb of 2017-07-26/petruske/2aa694
[Last edited by petruske - Jul 26, 2017 10:34 AM (+)]
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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
Jul 26, 2017 10:38 AM CST
I do think the slug looking one could do some damage.
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
Jul 26, 2017 10:45 AM CST
I agree with Larry, the slug is the more likely problem. I think the bottom ones are centipedes rather then millipedes although a sharper picture might help there. Either way they're not likely to be damaging the leaves.
Name: Char
Vermont (Zone 4b)
Daylilies Forum moderator Garden Ideas: Master Level Celebrating Gardening: 2015 Hosted a Not-A-Raffle-Raffle Region: Vermont
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Char
Jul 26, 2017 5:21 PM CST

Moderator

I agree Snails and slugs. This year I have a bumper crop and lots of leaf damage between them and two hail storms. In a normal year the drier beds where I rarely see a snail or slug the foliage is unmarked. The seedling bed where the plants are tight together and the ground doesn't dry (there's a spring on the back side of one of the beds) always shows the worse damage.

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