Once merged, the companies plan to then split off into three separate businesses, one of which will be focused on agriculture.
The prospect of fewer, larger companies controlling so much of the basic food supply is giving some farmers and anti-trust advocates heartburn.
The U.S. Senate Judiciary Committee plans to examine proposed mergers among agricultural chemical and seed companies in a September hearing.
EPA received new information that suggests the herbicide Enlist Duo is more toxic to plants than the agency previously thought.
Farmers who switch from Roundup to Enlist will be nearly doubling the amount of chemicals they pour on their land.
Monsanto and Dow Chemical have been developing new genetically-modified seeds, but the USDA has hit the brakes on their release to market.