"In 2006, limited cultivation trials in Idaho. Since 2007, commercial cultivation, 2010 on 470,000 ha (95% of total sugar beet acreage).
An US district court revoked the approval of GM sugar beets in August 2010. Additional planting won’t be allowed until the U.S. Department of Agriculture submits further environmental impact statements. "
http://www.gmo-compass.org/eng/database/plants/13.sugar_beet.html