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Wheat Blue dwarf phytoplasma (WBDp) disease is an important plant disea-se in the northwest region of China.It is transmitted by the leafhopper, Psammotettix striatus, in the field.The disease occurs in this region periodically and often cause sgnificant damages.Because the phytoplasma cannot be cultured up to date, there are la-rge amounts of limitations on phytoplasma researches.