Idaho OnePlan recommends the website of the
Idaho Weed Awareness
Campaign as the best resource for up-to-date information about
Idaho's noxious weeds, and their control.
Source for this page: Idaho's Noxious Weeds by Robert H. Callihan & Timothy W. Miller
Rush skeletonweed (Chondrilla juncea) is a native of Eurasia. It generally prefers well-drained, light soils. The plant spreads primarily by seed, but roots scattered by cultivation can aid in spread.
Rush skeletonweed is a perennialPlant that lives for more than 2 growing seasons whose branched stems may be 4 feet tall and superficially appear leafless. BasalAt the base of plant or plant part leaves form a dandelionlike rosetteA circular, normally basal, clump of leaves that withers as the flower stem develops. Stem leaves are narrow and up to 4 inches long. The lowest 4 to 6 inches of the stem is covered with coarse brown hairs. Stems and leaves both produce a milky latex. Yellow flower heads are ¾ inch in diameter and are scattered among the branches from midsummer to fall. The seed is ribbed and bears a soft, white plumeA hairlike or featherlike structure, often on a seed.
Rush skeletonweed infests several million acres in the Pacific Northwest and California, including these Idaho counties.
Biological control agents (a stem/leaf rust, a bud gall mite, and a stem/leaf gall midge) are available, occasionally providing good control west of rush skeletonweed. Herbicides, if applied consistently each year, can control this weed after 3 to 5 years. .