Publications for:

pest = Phytoplasma australiense
crop = Celery (Apium graveolens)

found 2 publications:

2011
New hosts of "Candidatus Phytoplasma australiense" in New Zealand
Australasian Plant Pathology (2011) 40 (3), 238-245
publishers website - pestinfo wiki

An update on phytoplasma diseases in New Zealand
Bulletin of Insectology (2011) 64 (Suppl.), S93-S94
publishers website - pestinfo wiki