Publications for:

pest = 16SrI phytoplasma group
crop = Watercress (Nasturtium officinale)

found 2 publications:

2006

Detection, characterisation and transmission by Macrosteles leafhoppers of watercress yellows phytoplasma in Hawaii
Annals of Applied Biology (2006) 149 (3), 357-363
publishers website - pestinfo wiki

2002

First report of phytoplasmas infecting watercress in Hawaii
Plant Disease (2002) 86 (3), p. 331
publishers website - pestinfo wiki