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Abstract
A general discussion is provided of the waterhyacinth, which may become weed as a result of its uncontrolled reproduction, and of the five main control methods. The Mexican Aquatic Weed Control Program (PROCMA) is described, including its goals and guidelines. Information is given concerning COD, DO, pesticide residues, pH, conductivity and total phosphorus resulting from the use of 2,4‐D, diquat and glyphosate in three dams infested with water hyacinth and cat‐tail.