Reuters reports that the European Commission has started an in-depth investigation of Bayer’s planned $66 billion takeover of U.S. seeds group Monsanto, saying it was worried about competition in various pesticide and seeds markets. The deal would create the world’s largest integrated pesticides and seeds company, the Commission said, adding this limited the number of competitors selling herbicides and seeds in Europe. If the deal goes through, the newly merged company will be one of the largest agrochemical firms in the world and could put 90 percent of the world’s food supply in the hands of only four multinational corporations.