PCR amplification was performed
using a universal phytoplasma primer pair
SN910601/SN011119 (Jung et al. 2003) that amplifies a
1.8-kbp fragment containing the 16S rRNA gene and
intergenic spacer regions of the 16S and 23S rRNA genes.
The PCR resulted in amplification of the expected 1.8-kbp
DNA fragment from all symptomatic, but not from
asymptomatic, hydrangea samples (data not shown).