During the past 50 years, the acreage of land placed under irrigation in the western United States has increased greatly to meet the growing demand for food and fiber production. To provide this water for crop production it is necessary not only for river waters to be impounded and irrigation canal distribution systems established but also for the irrigation waterways to be free of obstructing plant growths which impede the flow of water. This requires various types of weed control measures in order that originally designed carrying capacities of the waterways may be maintained. Methods involving new techniques developed mostly in the greenhouse and laboratory are suggested, which may make possible eradication or control with less expenditure of time, effort, and cost.
United States Department of the Interior, Bureau of Reclamation, "Weed Control Investigations On Some Important Aquatic Plants Which Impede Flow of Western Irrigation Water" (1954). Elusive Documents. Paper 107.