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DISEASE: Citrus stubborn disease

HOST: Citrus (sp. unknown)

Characteristic symptoms of thickened peel at peduncle end and aborted seeds.

Citrus stubborn disease | Citrus (sp. unknown)

DISEASE: Citrus stubborn disease

HOST: Citrus (sp. unknown) (Citrus sp.)

PATHOGEN: Spiroplasma citri

SOURCE: APS

DISEASE: Citrus stubborn disease

HOST: Citrus (Orange)

Severely stunted sweet orange tree. Foliage is dense and abnormally upright. Leaves may be cupped and unusually thick. They also may be chlorotic and mottled.

Citrus stubborn disease | Citrus (Orange)

DISEASE: Citrus stubborn disease

HOST: Citrus (Orange) (Citrus sinensis)

PATHOGEN: Spiroplasma citri

SOURCE: S. M. Garnsey

DISEASE: Citrus stubborn disease

HOST: Citrus (Orange)

Fruit from a diseased tree are frequently lopsided or acorn-shaped, usually few and small. They may not color at stem end.

Citrus stubborn disease | Citrus (Orange)

DISEASE: Citrus stubborn disease

HOST: Citrus (Orange) (Citrus sinensis)

PATHOGEN: Spiroplasma citri

SOURCE: J. M. Bove, M. Garnier

DISEASE: Citrus stubborn disease

HOST: Citrus (Orange)

Sweet orange exhibiting off-season flowering and crop heterogeneity. Diseased trees generally have shoots with shortened internodes, which lead to rosettes with cupped leaves.

Citrus stubborn disease | Citrus (Orange)

DISEASE: Citrus stubborn disease

HOST: Citrus (Orange) (Citrus sinensis)

PATHOGEN: Spiroplasma citri

SOURCE: J. M. Bove, M. Garnier

DISEASE: European stone fruit yellows

HOST: Almond

The disease causes yellowing and rolling of leaves (right). Leaves become thick and rough in texture. Healthy leaves (left).

European stone fruit yellows | Almond

DISEASE: European stone fruit yellows

HOST: Almond (Prunus dulcis)

PATHOGEN: 'Candidatus Phytoplasma prunorum'

PATHOGEN SYNONYM: Phytoplasma Apple proliferation group

SOURCE: E. Seemueller