"Candidatus Phytoplasma allocasuarinae"
"Candidatus Phytoplasma asteris"
"Candidatus Phytoplasma australiense"
"Candidatus Phytoplasma castaneae"
"Candidatus Phytoplasma cynodontis"
"Candidatus Phytoplasma japonicum"
"Candidatus Phytoplasma mali"
"Candidatus Phytoplasma morrenia"
"Candidatus Phytoplasma oryzae"
"Candidatus Phytoplasma persicae"
"Candidatus Phytoplasma pini"
"Candidatus Phytoplasma prunorum"
"Candidatus Phytoplasma pyri"
"Candidatus Phytoplasma rhamni"
"Candidatus Phytoplasma spartii"
"Candidatus Phytoplasma trifolii"
"Candidatus Phytoplasma ulmi"
"Candidatus Phytoplasma ziziphi"
Phytoplasma are specialised wall-less bacteria being obligate parasites of plant phloem tissue, and some insects. Many phytoplasma species are pathogens of important crops. Phytoplasma australiense causes the disease "Sudden Decline" in New Zealand cabbage trees.

The genus name Phytoplasma is yet to be formally recognised, and is currently at Candidatus status. There are currently 13 groups based on differences in the 16S rRNA molecule:
16SrIII (X-disease group)
16SrIV (Coconut lethal yellows group)
16SrV (Elm yellows group)
16SrVI (Clover proliferation group)
16SrVII (Ash yellows group)
16SrVIII (Luffa witches'-broom group)
16SrIX (Pigeon pea witches'-broom group)
16SrX (Apple proliferation group)
16SrXI (Rice yellow dwarf group)
16SrXII (Stolbur group)
16SrXIII (Mexican periwinkle virescence group)
16SrXIV (Bermuda white leaf group)
16SrXV (Hibiscus witches'-broom group)

External links

Ohio State University publishes an informative site on this topic.

The IRPCM Phytoplasma/Spiroplasma Working Team - Phytoplasma taxonomy group: Candidatus Phytoplasma, a taxon for the wall-less, non-helical prokaryotes that colonize plant phloem and insects. Int. J. Syst. Evol. Microbiol., 2004, 54, 1243-1255. Article in IJSEM Online