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Molecular identification and sequence polymorphism of phytoplasma associated with jujube witches’ broom in Shandong Province A Study on Peroxidase Isoenzymes in Crataegus pinnatifida var.major with Witches’Broom Characterization of Immunodominant Membrane Protein Gene from Peanut Witches’ Broom Phytoplasma and Bait Plasmid Construction CHANGES IN PEROXIDASE ISOENZYMES IN PERIWINKLE INFECTED BY THE PAULOWNIA WITCHES’ BROOM AGENT(MLO) Observation by Electron Microscope for Mycoplasma-like Organism in Large Chinese Hawthorn with Witches’ Broom