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European stone fruit yellows

Scientific Name
Candidatus Phytoplasma prunorum
Scientific Author
(Phytoplasma: Acholeplasmatales: Acholeplasmataceae: Candidatus: 16SrX Apple proliferation group)

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Diagnostic Images (11)
Diagnostic Notes

 Bacteria; Firmicutes; Mollicutes; Acholeplasmatales; Acholeplasmataceae; Candidatus Phytoplasma; 16SrX (Apple proliferation group)



Ca. P. prunorum is associated with European stone fruit yellows (ESFY) disease, which includes diseases of apricot, cherry, peach and Japanese plum (Lorenz et al., 1994; Seemüller and Foster 1995; Marcone et al., 1996).  ESFY affected trees flower and shoot in winter, which leads to lack of fruit production and chlorosis of the leaves later in the growing season. The early break in dormancy increases the susceptibility of affected trees to frost, which can cause damage to the phloem. During the early stage of disease often only a few branches are affected but the whole tree may become affected as the disease progresses. Infected shoots are typically shorter and bear smaller, deformed leaves. Leaves can drop prematurely. Shoots may die back. Yield is reduced. Fruit on affected branches develops poorly and may fall prematurely. Many stone fruit tree species or varieties show decline (Nemeth, 1986; Seemüller and Foster 1995).


Specific symptoms in apricot (apricot chlorotic leafroll) include upward curling of leaves, which are chlorotic. In Japanese plum (plum leptonencrosis) the leaf margins roll upward and leaves may be chlorotic. In peach the midribs and lateral veins of the leaves can become enlarged and corky tissue develops along the veins. The leaves become red and roll upward. In cher

More Information
Specimen Contact
Dr Fiona Constable
Constable FE & Gibb KS
14/08/2006 06:47 AEST
Last Updated
21/10/2011 09:31 AEST
Constable FE & Gibb KS (2006) European stone fruit yellows (Candidatus Phytoplasma prunorum) Updated on 10/21/2011 9:31:14 AM Available online: PaDIL -
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