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A '''herbicide''' is a [[pesticide]] used to kill unwanted [[plant]]s. Selective herbicides kill specific targets while leaving the desired crop relatively unharmed. Some of these act by interfering with the growth of the weed and are often based on plant [[hormones]]. Herbicides used to clear waste ground are nonselective and kill all [[plant]] material with which they come into contact. Some plants produce natural herbicides, such as the genus Juglans ([[walnut]]s). Herbicides are widely used in [[agriculture]] and in landscape turf management. They are applied in total [[vegetation]] control (TVC) programs for maintenance of highways and railroads. Smaller quantities are used in forestry, pasture systems, and management of areas set aside as wildlife [[Habitat (ecology)|habitat]].
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