Abstract
Spiraea salicifolia is widely grown in China as an ornamental plant, and its roots and young leaves have many medical uses. On the campus of Northwest A&F University, we observed diseased S. salicifolia plants that had yellowed, dwarfed, deformed leaves and other symptoms resembling diseases caused by phytoplasma. This study was aimed at determining the causal agent of the disease. On the basis of phytoplasma-specific DNA amplification by PCR, a phytoplasma infection of S. salicifolia was confirmed. The phytoplasma was related to “Ca. Phytoplasma ziziphi” according to RFLP and phylogenetic analyses. This report is the first of phytoplasma infection of S. salicifolia in China.
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