PACIFIC NORTHWEST NURSERY IPM Insects
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Contents: By Damage and Image |
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. Biology Damage Management 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. Resources: 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 Author: R.L. Rosetta, Extension Nursery Integrated Pest Management, Department of Horticulture, Oregon State University
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Gallery Hemerocallis gall midge blossom damage
Blossom damage from Hemerocallis gall midge Blossom damage from Hemerocallis gall midge Blossom damage from Hemerocallis gall midge Daylily bud damage from Hemerocallis gall midge larvae Bud damage from Hemerocallis gall midge Hemerocallis gall midge larvae crawling on lily bud An assortment of Hemerocallis gall midge-damaged lily buds (healthy bud at top of image) Hemerocallis gall midge larvae feeding within daylily bud |
Website editor: Robin Rosetta |