- May 26, 2017
Glyphosate, an herbicide and the active ingredient in Monsanto Co's popular Roundup weed killer, will be added to California's list of chemicals known to cause cancer effective July 7, the state's Office of Environmental Health Hazard Assessment (OEHHA) said on Monday.
Monsanto vowed to continue its legal fight against the designation, required under a state law known as Proposition 65, and called the decision "unwarranted on the basis of science and the law."
The listing is the latest legal setback for the seeds and chemicals company, which has faced increasing litigation over glyphosate since the World Health Organization's International Agency for Research on Cancer said that it is "probably carcinogenic" in a controversial ruling in 2015.
Earlier this month, Reuters reported that the scientist leading the IARC’s review knew of fresh data showing no link between glyphosate and cancer. But he never mentioned it, and the agency did not take the information into account because it had yet to be published in a scientific journal. The IARC classed glyphosate as a “probable carcinogen,” the only major health regulator to do so.
Dicamba, a weed killer designed for use with Monsanto's next generation of biotech crops, is under scrutiny in Arkansas after the state's plant board voted last week to ban the chemical.
OEHHA said the designation of glyphosate under Proposition 65 will proceed following an unsuccessful attempt by Monsanto to block the listing in trial court and after requests for stay were denied by a state appellate court and the California's Supreme Court.