Western rangeland weeds such as yellow starthistle, leafy spurge, Canada thistle and Russian knapweed are causing tremendous losses to agricultural industries, including both crop and livestock production, and to environmental resources on private lands. Concurrently, many public lands managed by federal agencies are being steadily invaded. As a result, these lands held in the public trust are experiencing reductions in commodity yields, recreational opportunities, biodiversity and ecosystem function.
U.S. Department of Interior, U.S. Department of Agriculture, and Riley Memorial Foundation, "Western Rangeland Noxious Weeds: Collecting, Sharing and Using Information" (2000). All U.S. Government Documents (Utah Regional Depository). Paper 481.