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DISEASE: Ash yellows

HOST: Ash

Ash sapling with basal sprouts and chlorotic leaves.

Ash yellows | Ash

DISEASE: Ash yellows

HOST: Ash (Fraxinus pennsylvanica)

PATHOGEN: 'Candidatus Phytoplasma fraxini'

PATHOGEN SYNONYM: Phytoplasma Ash yellows group

SOURCE: W. Sinclair

DISEASE: Elm yellows

HOST: Elm

Late stage of elm yellows disease.

Elm yellows | Elm

DISEASE: Elm yellows

HOST: Elm (Ulmus rubra)

PATHOGEN: 'Candidatus Phytoplasma ulmi'

PATHOGEN SYNONYM: Phytoplasma Elm yellows group

SOURCE: W. Sinclair

DISEASE: Pear decline

HOST: Pear

'Bartlett' pears were grafted onto tolerant rootstock. All trees are infected. Note yellowish, diseased branches.

Pear decline | Pear

DISEASE: Pear decline

HOST: Pear (Pyrus communis 'Bartlett')

PATHOGEN: 'Candidatus Phytoplasma pyri'

PATHOGEN SYNONYM: Phytoplasma Apple proliferation group

SOURCE: C. Smart