On average, South American farmers use 2-3 times more pesticides than farmers in Europe. 2-3 times more would be illegal in Europe, but is allowed as part of Mercosur trade.
Pesticides banned in Europe, but allowed in South America: Atrazine, Acephate, Mancozeb, Paraquat, and many more.
Diseases they can produce include: Parkinson's, brain damage in children and lower IQ, infertility, genetic mutations.