There are no U.S. grade standards for Yam. These instructions have been developed by the Fresh Products Branch to assist officially licensed inspectors in making inspections, writing certificates and to assist in the proper identification of specialty type fruits and vegetables.
Yam (Name, Chinese Yam, Cush Cush, Greater Yam, Lesser Yam, Boniato) is cultivated in the Orient, Caribbean and Latin American regions. It is an enlarged rootstock which somewhat resembles the sweet potato in general appearance. It should not be confused with the sweet potato as it belongs to a different family.
Detailed, Inspection Instructions & Other Resources: