AdvertisementSugar Beet Beatdown: Engineered Varieties BannedSeptember 16, 2010Dan CharlesfacebookEmailGenetically modified sugar beets make up 95 percent of the crop in the U.S. Farmers who grow sugar beets say there isn't enough conventional sugar beet seed around anymore, and they no longer have the field equipment necessary to clear weeds from their fields. (iStockphoto.com)