Broccoli stunt, a new disease in broccoli plants associated with three distinct phytoplasma groups in Brazil - Eckstein, Bárbara; Barbosa, Julio Cesar; Kreyci, Patricia Fabretti; Canale, Maria Cristina; Brunelli, Kátia Regiane; Bedendo, Ivan Paulo (Journal of Phytopathology, 2013)