ConcernThe first known B.C. infestation was found in the East Kootenay region north of Cranbrook in 1997. Subsequent infestations were found west of Kamloops near Walachin in 1998. Perennial pepperweed has spread rapidly in northern Europe, Mexico and all western U.S. states, except Arizona. It invades cropland, roadsides and idle areas but is a particular threat to riparian areas and rangelands. Much of the U.S. infestation is associated with river systems and wetland areas. The extensive, woody, deep creeping root systems makes perennial pepperweed exceptionally difficult to control.Agricultural producers, range and riparian area managers and the public are requested to be on the lookout for this devastating plant and to take immediate corrective action if the weed is found or suspected. Damage CausedPerennial pepperweed is well adapted to a wide range of conditions from the lower edge of coniferous forests to dry sagebrush and alkaline areas. Once established it forms dense, competitive monocultures. Infestations degrade wildlife habitat, lower the yield and quality of forage on pastures and hayfields and destroy biodiversity by interfering with regeneration of native plant species. What Can You Do?Prevention to reduce the chances of introduction into a clean field or riparian area should receive the highest priority.
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