Roundup's active ingredient is glyphosate, which thousands of plaintiffs blame for causing them to develop cancer.
Scientists at four leading universities have seen their soybean experiments injured by a stealthy vandal: drifting fumes from a weedkiller called dicamba, now popular among farmers.
The world's most widely used weed killer was once seen as one of the safest pesticides. Now it is blamed for causing cancer. Yet the scientific evidence remains disputed.
The verdict represents the third time a California jury has decided in favor of consumers who claimed their cancer was caused by the glyphosate-based Roundup weed killer.
The verdict represents the second time a jury has decided in favor of a multimillion-dollar damage award after concluding that Roundup caused cancer.
Some farmers say they're buying a popular new soybean seed partly because they're afraid of crop damage from herbicide drift. A new lawsuit claims the seed maker is violating antitrust laws.
The Environmental Protection Agency has given farmers the OK to continue to spray the controversial weedkiller dicamba. The chemical is prone to blowing in the wind and damaging other vegetation.
Dewayne "Lee" Johnson, 46, says the company's Roundup weedkiller caused his illness. He will accept the award after a judge reduced a jury's original figure of $289 million.
The jury had awarded $250 million in punitive damages and $39.25 million in compensatory damages to a groundskeeper who contracted cancer after spraying a powerful version of the weedkiller Roundup.