Almost 30 percent of farmers in the U.S. who grew genetically modified corn last year violated planting restrictions meant to keep insects from becoming resistant to the crop, according to a biotech industry survey submitted to the U.S. EPA this week. More than 90 percent of the farmers thought they had followed the rules, but many couldn’t identify the correct restrictions when asked in the survey. A spokesperson for biotech giant Monsanto pointed to the fact that 71 percent of farmers correctly followed rules and said the survey showed that “farmers want to do the right thing.” But Margaret Mellon of the Union of Concerned Scientists countered that a lot more work needs to be done.