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Species
Information
- rush
skeletonweed (hogbite)
- Chondrilla
juncea L.
- USDA
Symbol: CHJU
- Oregon
Noxious Weed Designation: B, T
- Pictures
ALERT: PLEASE CALL 1-866-INVADER IF YOU SUSPECT YOU HAVE FOUND THIS SPECIES
Identification:
Perennial; blooms July to September. Grows 1 to 4 ft tall. Yellow flower 3/4 inch in diameter with 7 to 15 petals. Coarse downbent hairs on the lower 4 to 6 inches of stem; almost no leaves. Spreads primarily by seed, but roots scattered by cultivation can aid in spread.
Impacts: Rush skeletonweed is an aggressive plant in both rangeland and cropland, particularly in light textured soil and has been the target of large control projects for decades. Cereal grain and potato production areas are at risk from skeletonweed invasion. Impacts include reduced yield due to competition and harvest difficulties with combine harvesters from latex sap that is exuded from the plant. Extensive efforts have been made to eradicate or contain outbreaks, but new sites are being found each year in Eastern Oregon.
Biological
Controls: Four biocontrol agents are approved for release. Three of these, a gall midge, a gall mite and a rust fungus, have been established in Oregon, but have only been effective in reducing seed production.
Oregon
Maps of Rush Skeletonweed Distribution
Links:
USDA
Plants Database information on rush skeletonweed
GRIN
Database information on rush skeletonweed
Oregon Department
of Agriculture information on rush skeletonweed
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