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Perennial pepperweed (Lepidium latifolium L.) is native to southern Europe and western Asia and has become dominant on some wetlands in the intermountain west. It has been declared a noxious weed in several western states. Original importations were thought to be in contaminated sugarbeet (Beta vulgaris L.) seed. Spread of this weed is usually by water carrying seed from upstream areas. Once established, perennial pepperweed rapidly spreads by rhizomes especially in moist soils crowding out native and other desirable vegetation. Mosquito control efforts have also been impacted by this weed. This replicated, repeated study evaluated herbicide control of perennial pepperweed in two locations in a Riverine environment. Low rates of Escort (1/2 to 3/4 oz. per acre) applied during the bud stage produced excellent control the first year of application and maintained good control the following year. source:abstract