Contents: By Damage and Image
In progress
Contents: Alphabetical

alder flea beetle
aphid management
apple and thorn skeletonizer
apple ermine moth
ash whitefly
azalea bark scale
azalea lace bug
azalea sawfly
Bagrada bug
bark lice
Barypeithes root weevil
Beneficial nematodes
biocontrol of root weevils
birch aphid
black bean aphid
black cherry aphids
black stem borer
bluegum psyllid
Boisduval scale
branch and twig borer
brown marmorated stink bug

bronze birch borer
boxwood leafminer
boxwood psyllid
bulb flies
cabbage whitefly
carnation tortrix
carpet beetle (images)
Calligraph californica

Ceanothus stem gall moth
cereal leaf beetle
cherry ermine moth
chilli thrips
cinnabar moth
clay colored weevil
cottony camellia scale

crane flies
cypress tip moth

dogwood sawfly
Douglas fir sawfly
Douglas fir twig weevil
elm leafminer
European pine sawfly new
European pine shoot moth
European wool carder bee
emerald ash borer
Fall webworm
fir coneworm new
flatheaded cedar borer
ground beetle gallery
Hemerocallis gall midge new
hollyhock weevil
honeylocust plant bug
honeylocust pod gall midge
Heliothis phloxiphaga
holly bud moth
huckleberry root aphids
ground mealybug
Japanese beetle
lady beetle gallery
leaf weevil
light brown apple moth
Linden aphid new
lupine aphid new
Macrosiphum rhamni new
maple aphids
maple tip moth
maple midge
March flies
mountain ash sawfly
Myzocallis sp. on red oak new
Narcissus bulb fly
natural enemies gallery
oak ambrosia beetle
oak slug
oak twig gall wasp
obscure root weevil
Pacific flatheaded borer
peach tree borer
peach twig borer
pear blight beetle
pear psylla
pear leaf-curling midge
pear sawfly
pine needle scale
pine and cone spittlebug
poplar and willow borer
Psyllopsis fraxinicola
rose curculio weevil
rose midge
rove beetle gallery
rose stem girdler
sequoia pitch moth
soldier beetle gallery
snapdragon plume moth new
snakefly gallery
speckled green fruitworm
meadow spittlebug
spotted asparagus beetle
spruce twig aphid
tent caterpillars
viburnum leaf beetle
violet gall midge
western poplar clearwing
western spotted cucumber beetle
white pine weevil
woolly alder aphid new
woolly ash aphid
woolly beech aphid

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Hemerocallis gall midge

The daylily gall midge or Hemerocallis gall midge (Contarinia quinquenotata) is a damaging pest of daylilies. The midge is thought to have originated from Asia, the native home of Hemerocallis spp. It was first noted in Europe, where it is now widespread, in the 1880's and found in England in 1989. Detected in Vancouver, British Colombia in 2001, it was found in 2007 in Washington. The range of the midge is expanding in the state of Washington. There are reports of it in Whatcom, Skagit Valley, Bellevue, Everett, Granite Falls and in the Puget Sound area. Oregon growers need to be alert about this pest and make sure they inspect any plant material from infested areas for signs of these insects.

The adult midges emerge from the soil, from whence they overwinter, and lay eggs on developing buds of daylilies, Hermocallis sp., usually from May through June. The larvae that hatch from these eggs are small and legless maggots. The white midge maggots can be numerous and are usually found feeding within the buds but are sometimes seen on the outside of the buds. There is one generation per year.

Feeding by the maggots on the developing lily buds causes the buds to become distorted. Buds appear swollen and discolored. Many buds are shriveled and may not completely form. Blossoms from affected buds are also deformed and often have crinkled petal edges.

Cultural management is focused on avoidance of early-blooming, particularly yellow, varieties (although in 2017, reports were of damage on the late-blooming varieties rather than early varieties, possibly due to the long cool wet spring). Infested buds should be removed and properly disposed (burned or bagged and removed). Do not put removed buds in the compost. As the midge overwinters in the soil, bare root or soilless plant starts may reduce the risk of introduction of the pest.

Chemical management has been timed to protect new buds. The midges can lay eggs for several weeks so many growers opt for systemic over contact applications. Halstead (see Resources) has information on chemical trials for this midge.


Hemerocallis Daylily Midge. American Hemerocallis Society. This site also includes a list of late-blooming varieties courtesy of the RHS. <13 July 2017>

Daylily gall midge. Hortsense - WSU Extension. <13 July 2017>

Halstead, A. Hemerocallis gall midge study. <13 July 2017>

Hemerocallis gall midge. Royal Horticulture Society. <13 July 2017>





Original publication: 7/12/17
Last update: 7/14/17

Author: R.L. Rosetta, Extension Nursery Integrated Pest Management, Department of Horticulture, Oregon State University



Hemerocallis gall midge blossom damage
daylily midge blossom damage


Blossom damage from Hemerocallis gall midge
daylily midge blossom damage

Blossom damage from Hemerocallis gall midge
Blossom damage from daylily midge

Blossom damage from Hemerocallis gall midge
Blossom damage from daylily midge

Daylily bud damage from Hemerocallis gall midge larvae
daylily midge damage to blossoms

Bud damage from Hemerocallis gall midge
Bud damage from daylily midge

Hemerocallis gall midge larvae crawling on lily bud
daylily larvae on lily bud

An assortment of Hemerocallis gall midge-damaged lily buds (healthy bud at top of image)
daylily midge damage to lily buds

Hemerocallis gall midge larvae feeding within daylily bud
Daylily midge larvae feeding within daylily bud

Hemerocallis gall midge larvae feeding within bud
daylily midge larvae feeding within bud

Hemerocallis gall midge larva close-up
daylily larva close-up

Website editor:
Robin Rosetta

Page last modified 7/14/17


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