@ARTICLE {CHANG:2004, title = {Aster yellows phytoplasma associated with chai hu plants in Canada}, author = {Chang, K. and Hwang, S. and Howard, R. and Blade, S. }, journal = {Zeitschrift fur Planzenkrankheiten und Pflanzenchutz}, year = {2004}, volume = {111}, number = {3}, pages = {218--224}, }