Zhao, Y First Report of Witches'-Broom Disease in a Cannabis spp. in China and Its Association with a Phytoplasma of Elm Yellows Group (16SrV). [electronic resource] - Plant disease Feb 2007 - 227 p. digital Publication Type: Journal Article ISSN: 0191-2917 Standard No.: 10.1094/PDIS-91-2-0227C doi