United States (USA)
农业: Competes with crops, forage for livestock, and impedes the movement of livestock because they avoid entering the dense stands.
竞争: Affects ecosystems by competing with native plants, including rare and endangered species.
经济 /民生: Costs farmers in the United States and Canada millions of dollars each year in lost crop yields and management expenses.
New Mexico (United States (USA))
竞争: In New Mexico, C. nutans is also encroaching on the habitat of rare and endangered species, such as Mescalero thistle (Cirsium vinaceum ), which grows in springs, seeps, and marshy valley bottoms in east of this state. C. vinaceum is closely related to C. nutans , making control techniques, such as herbicides, difficult to use without killing both species.