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 BUENOS AIRES, Argentina — Dr. Andres Carrasco, an Argentine neuroscientist who challenged pesticide regulators to re-examine one of the world’s most widely used weed killers, has died. He was 67.

Argentina’s national science council announced Carrasco’s death on Saturday. He had been in declining health.

Carrasco, a molecular biologist at the University of Buenos Aires and past-president of Argentina’s CONICET science council, was a widely published expert in embryonic development whose work focused on how neurotransmitters affect genetic expression in vertebrates. But none of his research generated as much controversy as his 2010 study on glyphosate, which became a major public relations challenge for the St. Louis, Missouri-based Monsanto Company.

Glyphosate is the key ingredient in Monsanto’s Roundup brand of pesticides, which have combined with genetically modified “Roundup-Ready” plants to dramatically increase the spread of industrial agriculture around the world. The U.S. Environmental Protection Agency and other regulators have labeled it reasonably safe to use if applied properly. But few countries enforce pesticide rules as rigorously as the United States, and farming’s spread has increasingly exposed people to glyphosate and other chemicals.

Carrasco, principal investigator at his university’s Cellular Biology and Neuroscience Institute, told The Associated Press in a 2013 interview that he had heard reports of increasing birth defects in farming communities after genetically modified crops were approved for use in Argentina, and so decided to test the impact of glyphosate on frog and chicken embryos in his laboratory.