syngenta's marketing is for syngenta, its shareholders. it's not for helping farmers.ing farmers, this is hurting farmers. >> reporter: in fact, the two countries where the product is produced -- the uk and china -- have banned its domestic use. even as a state-owned chinese chemical company acquired syngenta in a record $43 billion deal in 2017, touted in this video. >> the fact that the chinese government essentially owns syngenta, but doesn't use it in their own country, but they continue to sell it here? that's ridiculous. we as americans should be outraged by this. >> reporter: part of the outrage, flowers claims, is that both companies did not reveal critical information about paraquat to its users, including questions some of their own scientists and executives were aware of for decades. >> there has been smoke about paraquat causing parkinson's disease since the late '80s and '90s. that also is driven somewhat by what syngenta internally knows or doesn't know and discloses to the scientific community. >> reporter: some of this came to light in a 2017 lawsuit af