As the U.S. growing season entered its peak this summer, farmers began posting startling pictures on social media: fields of beans, peach orchards and vegetable gardens withering away.
The photographs served as early warnings of a crisis that has damaged millions of acres of farmland. New versions of the herbicide dicamba developed by Monsanto and BASF, according to farmers, have drifted across fields to crops unable to withstand it, a charge authorities are investigating.
As the crisis intensifies, new details provided to Reuters by independent researchers and regulators, and previously unreported testimony by a company employee, demonstrate the unusual way Monsanto introduced its product. The approach, in which Monsanto prevented key independent testing of its product, went unchallenged by the Environmental Protection Agency and nearly every state regulator.