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Species
Information
- tansy
ragwort (stinking willie)
- Senecio
jacobaea
L.
- USDA
Symbol: SEJA
- Oregon
Noxious Weed Designation: B, T
- Pictures
ALERT: PLEASE CALL 1-866-INVADER IF YOU SUSPECT YOU HAVE FOUND THIS SPECIES EAST OF THE CASCADES.
Identification: Biennial or short-lived perennial; blooms midsummer to fall. Grows 1 1/2 – 6 ft tall. Leaves dark green, deeply lobed. Numerous seed heads, each with multiple, yellow, multi-rayed flowers. Reproduces by seed only.
Impacts: Tansy ragwort is toxic to cattle and horses, causing irreversible liver damage. Once considered Western Oregon's most serious noxious weed, biological controls have reduced the severity of outbreaks below economic threshold levels.
Biological
Controls: Three biological control agents, a seed head fly, a flea beetle and a moth, have been approved for release and are established in Western Oregon. Eastern Oregon populations are still sparse and are being managed for eradication and containment.
Oregon
Maps of Tansy Ragwort Distribution
Links:
USDA
Plants Database information on tansy ragwort
GRIN
Database information on tansy ragwort
Oregon Department
of Agriculture information on tansy ragwort
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