Daylilies forum: Daylily Gall Midge

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Name: Eleanor Smith
Victoria, B.C.
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Eleanor
May 31, 2016 4:24 PM CST
Does anyone know if there's any way of getting rid of the hemerocallis gall midge? It ruins the flowers. Thanks.
Name: Elena
NYC (Zone 7a)
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bxncbx
Jun 1, 2016 8:50 AM CST
Hi Eleanor! I'd never heard of this pest so I did some internet research. It seems to be a fly that lays it's eggs on the flower buds and the larva eat them. From what I read the flies emerge in the early Spring and only lay eggs once a year so only early blooming daylilies are affected.

The easiest way to control them is to remove the infested buds and place them in bleach or a plastic bag and get rid of them (don't compost them). You could also get rid of your early bloomers and stick with later blooming cultivars.

It seemed like people were able to decrease the midge population significantly just by removing the infested buds. Hope that helped!
Name: Sue
Ontario, Canada (Zone 4a)
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sooby
Jun 1, 2016 9:35 AM CST
There's some information from the American Hemerocallis Society here:

http://www.daylilies.org/ahs_dictionary/gallmidge.html

Their link to the AHS/RHS research is broken. I'll find the article and come back to post the new link.

Sorry to hear you're being affected by this significant daylily pest.

Edited to add link to AHS and RHS research
https://www.rhs.org.uk/science/pdf/plant-health/Halstead-201...
[Last edited by sooby - Jun 1, 2016 9:37 AM (+)]
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Name: Eleanor Smith
Victoria, B.C.
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Eleanor
Jun 1, 2016 8:44 PM CST
:Thankyou: I used to have about 50 varieties of daylilies but gradually have been taking some out that are always badly infected. For some reason , not all are infected equally, even though they're blooming at the same time. Over the years, I've removed all the infected buds that I could but unless everybody does it, it doesn't seem to make a big difference. However, I'll carry on doing what I'm doing and hope for the best. I just thought maybe others had a secret![quote="sooby"]There's some information from the American Hemerocallis Society here:

http://www.daylilies.org/ahs_dictionary/gallmidge.html

Their link to the AHS/RHS research is broken. I'll find the article and come back to post the new link.

Sorry to hear you're being affected by this significant daylily pest.

Edited to add link to AHS and RHS research
]https://www.rhs.org.uk/science/pdf/plant-health/Halstead-201...

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