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Rhodiola plants exhibiting symptoms typical of phytoplasma infection were observed at an experimental farm near Edmonton, Alberta, Canada, in 2007. Phytoplasma infection was confirmed with a polymerase chain reaction (PCR)-assay using 16S ribosomal RNA primers developed specifically for phytoplasmas; the primers could amplify a band from tissue samples derived from infected, but not from asymptomatic,...
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