Paraquat was first produced for commercial purposes over 60 years ago by Imperial Chemical Industries. Paraquat is popular amongst farmers in the United States due to being quick-acting and non-selective in killing green plant tissue. Paraquat is also effective in killings weeds that have developed resistance to glyphosate, which is the active ingredient in Roundup. Exposure to Paraquat has been linked to the development of Parkinson’s disease.