
1. Virescence, loss of normal flower colour, green flowers
2. Phyllody, development of floral parts into leaf-like structures
3. Witches broom, proliferation of auxilary shoots
Etc, etc.
The phytoplasmas will move from infected plants into healthy plant by grafting (from rootstock or scion), but not by grafting tools.
It may well be that the plants with 'witches broom' growth and phyllody are phytoplasma infection symptoms. Maybe the color break in 'Peach' and Jade Peony are too- we just don't know.
Its my experience that the symptoms are variable- they will go on and off in the same plant and seem at least partly related to growing conditions. I feel growth and blooming are definitely affected, especially when the symptoms are severe.
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