The aster yellows phytoplasma is transmitted by the aster leafhopper. Aerial tubers may form on affected plants and affected stems usually die prematurely.

Terminal growth may appear yellowish in
some varieties
Terminal growth appears bunched and the
leaflets roll up at the margins and develop a
purplish colour The leaves may be rigid at first
but later they wilt
Early symptoms of purple top
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T.G. Lynn
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