Two farmers from the Miao ethnic minority group spray pesticide on their Panax pseudoginseng field. Dehou Town, Wenshan County, Yunnan Province. The Wenshan Prefecture is the origin and the main production area where almost 98 percent of China's total pseudoginseng fields are. Greenpeace is currently investigating pesticide residue in Chinese herbal medicine and highlighting the need to end the use of toxic chemicals in industrial agriculture.