 A less volatile formulation of dicamba made by Monsanto, designed to be less prone to vaporizing and inhibit unintended drift between fields, was approved for use in the United States by the EPA in 2016, and was expected to be commercially available in 2017.Some farmers and researchers have expressed concern about herbicide resistance after the introduction of resistant crops.In the laboratory, researchers have demonstrated weed resistance to dicamba within three generations of exposure.