A corn purchaser writes on his account in northwest China in 2012. In November 2013, officials began rejecting imports of U.S. corn when they detected traces of a new gene not yet approved in China. Peng Zhaozhi/Xinhua/Landov hide caption

itoggle caption Peng Zhaozhi/Xinhua/Landov

Yonathan Zohar, Jorge Gomezjurado and Odi Zmora check on bluefin tuna larvae in tanks at the University of Maryland Baltimore County's Institute of Marine and Environmental Technology. Courtesy of Yonathan Zohar hide caption

itoggle caption Courtesy of Yonathan Zohar

Investigators at the U.S. Department of Agriculture have discovered cases of organic fraud abroad as well as in the U.S. In 2013, 19 farmers or food companies were fined a total of $87,000 for misusing the organic label. Mark Andersen/Rubberball/Corbi hide caption

itoggle caption Mark Andersen/Rubberball/Corbi

Organic fruits and vegetables deliver between 20 and 40 percent more antioxidants than conventional fruits and vegetables, a new study finds. Molly Marshall/Flickr hide caption

itoggle caption Molly Marshall/Flickr

Foster Farms set up new procedures to deal with salmonella contamination after the USDA threatened to shut down its plants last fall. Justin Sullivan/Getty Images hide caption

itoggle caption Justin Sullivan/Getty Images

Writer Arlo Crawford (left) with his father, Jim Crawford, an elder statesman of the organic farming movement who dropped out of law school in 1972 to grow vegetables. Melanie McLean/Courtesy of Henry Holt and Co. hide caption

itoggle caption Melanie McLean/Courtesy of Henry Holt and Co.

David Ng (right) and Amanda Furrow, Customs and Border Protection agricultural specialists, inspect wheat for insects and alien seeds at a port in Baltimore, Md. Dan Charles/NPR hide caption

itoggle caption Dan Charles/NPR