when was round up first used
History of Monsantoâs Glyphosate Herbicides. June 2005. The original RoundupÂ® herbicide1, containing the active ingredient glyphosate, was introduced. in 1974. Today, RoundupÂ® WeatherMax, RoundupÂ® UltraMAX , and other glyphosate. agricultural herbicides produced by Monsanto are among the worldâs most widely used.