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Species
Information
- kochia
(Mexican fireweed)
- Kochia
scoparia (L.) Schrad. = Brassia scoparia (L.) A.J.
Scott
- USDA
Symbol: KOSC
- Oregon
Noxious Weed Designation: B
- Pictures
Identification: Annual; blooms July to October. Grows 1 to 6 ft tall. Stems many branched, round, slender and often red-tinged. Leaves 1/2 to 2 inches long, alternate, lance-shaped with margins fringed with hairs. Leaf blades have 3 or 5 prominent veins. Flowers inconspicuous in spikes in the axils of upper leaves.
Impacts:
Kochia is a highly adaptable plant that invades a wide variety of habitats in the dryer portions of Oregon. It provides a significant challenge to right-of-way maintenance professionals because of its ability to develop resistance to many herbicides. This plant has been reported to reduce crop yields in cereal grain by 100% in severe infestations. It is also an alternate host for beet yellows and tobacco mosaic virus.
Biological
Controls: No approved biological control agent is available.
Oregon
Maps of Kochia Distribution
Links:
USDA
Plants Database information on
kochia
GRIN
Database information on kochia
Oregon Department
of Agriculture information on kochia
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