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. As the crisis intensifies, new details provided to Reuters ... 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. Typically, when a company develops a new agricultural product, it commissions its own tests and shares the results and data with regulators. It also provides product samples to universities for additional scrutiny. In this case, Monsanto denied requests by university researchers to study its XtendiMax with VaporGrip for volatility - a measure of its tendency to vaporize and drift across fields. Monsanto provided samples of XtendiMax before it was approved by the EPA. However, the samples came with contracts that explicitly forbade volatility testing. Arkansas blocked Monsanto's product because of the lack of extra volatility testing ... but approved BASF's [product]. Thirty-three other states - every other state where the products were marketed - approved both products.