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Tree peony (Paeonia suffruticosais) plants with yellowing symptoms suggestive of a phytoplasma disease were observed in Shandong Peninsula, China. Typical phytoplasma bodies were detected in the phloem tissue using transmission electron microscopy. The association of a phytoplasma with the disease was confirmed by polymerase chain reaction (PCR) using phytoplasma universal primer pair R16mF2/R16mR1...
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