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Feb 1, 2019 8:57 PM CST
Name: Terry
Ohio (Zone 6a)
Gardens in Buckets Winter Sowing Vegetable Grower Region: United States of America Plant and/or Seed Trader Tomato Heads
Enjoys or suffers hot summers Garden Procrastinator Region: Ohio Hibiscus Dog Lover Daylilies
One of the sellers I bought from last season gifted me with leaf miners, and I ended up with a pretty bad infestation. When I posted here about it I was told that they would overwinter. (I truly didn't think that would happen this far north!)
This psychotic weather, polar vortex and all, has presented us with an extended period of sub-zero temperatures, at times dipping to -18 F. We've had brief periods of snow cover until recently, and cover for the past week or so.

Would this possibly be enough to kill off the leaf miner larva currently hiding in my daylilies? Crossing Fingers!
My "I'd-pawn-a-grandchild-for-a-single-fan" list: Absolutely Fantastic, Ambar Sun, Clown Pants, Of Olden Days, Wolfman, Stars And Stripes Forever, WYSIWYG.
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Feb 1, 2019 9:31 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
The daylily leafminer was first recorded in Maine, so I would not be too hopeful about winter killing it in Ohio.
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Feb 2, 2019 4:14 PM CST
Name: Maryl
Oklahoma (Zone 7a)
Cat Lover Daylilies Roses Container Gardener Plant Lover: Loves 'em all! Cactus and Succulents
Region: Oklahoma Enjoys or suffers hot summers
Where does it overwinter on dormant daylilies whose leaves have all dried up? In the soil? I used to get the occasional leaf miner here, but these last few years they seem to have doubled. I read there is a newer species/import of daylily leaf miner that is worse then the old one, but don't know if that's true or what is happening...........Maryl
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Feb 2, 2019 4:26 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
It spends the winter as a pupa in the base of the old leaves. Ophiomyia kwansonis is a new species to North America, it is of Asian origin and specific to daylilies. It's only been known in North America since the mid-2000s.
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Feb 2, 2019 8:36 PM CST
Name: Maryl
Oklahoma (Zone 7a)
Cat Lover Daylilies Roses Container Gardener Plant Lover: Loves 'em all! Cactus and Succulents
Region: Oklahoma Enjoys or suffers hot summers
Thanks Sooby. Does it infect other plants? I ask as I grow 95% of my daylilies in pots which every spring I freshen with root pruning and new potting mix. Depending on where the larvae reside on the root (as in right next to the crown itself) you'd think that I would have less of a problem then most. Also, plants from northern growers (from whom I buy almost exclusively) come bare root. I'm thinking this leaf miner is perhaps less specific then just daylilies?? as it's spreading nationwide? They really are becoming annoying.......Maryl
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Feb 2, 2019 8:46 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
They pupate in the mines in the leaves not the root. No it doesn't infect other plants, only daylilies, but there are many other kinds of leafminers that affect other plants.
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