Floral virescence in Rudbeckia hirta (black-eyed Susan)

Virescence refers to an abnormal development of green pigmentation within plant parts that are not normally green, such as shoots or flowers.

 

Virescence is closely associated with phyllody (the abnormal development of flower parts into leaves) and witches' broom (the abnormal growth of a dense mass of shoots from a single point).

 

These are often symptoms of the same disease affecting a plant and typically caused by phytoplasmas.

 

Here, the pathogen may be Aster yellows phytoplasma (AYP).

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