Java Bishopwood (Bischofia polycarpa(Levl.) Airy Shaw) is a kind of important broadleafspecies in the south of China. Bischofia polycarpa witches' broom(BiWB) disease, whosetypical symptoms includes leaves size reduction, yellowing, reddening, internode shorteningand lateral bud proliferation, occurs prevalently in its cultivation regions and leads to witches'broom, decline, dieback, even death. It is known that BiWB disease is caused by phytoplasma(previously termed mycoplasma-like organism), wh...