If producers are thinking about planting corn rootworm-resistant corn, they will first want to make sure their buyer is willing to buy that corn. You wouldn't want to plant corn rootworm corn without checking with them because it doesn't so much matter what the European Union wants, what really matters is what your buyer wants.
How a farmer controls corn rootworm in Indiana really depends on what sort of pest pressure they face. In southern Indiana, most farmers wouldn't treat for it at all because there are very few corn rootworm larvae in that part of the state. In the moderate region in northeast and central Indiana, farmers may use soil insecticides or seed treatments for control. In the high pressure northwest corner of Indiana, most farmers use soil insecticides and some use seed treatments.