RESULTS

(5)

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DISEASE: Aster yellows

HOST: Squash

Diagnostic characteristics for the disease are yellowing of young leaves, proliferation of secondary shoots, and rigid erect habit. Leaves are misshapen and smaller than normal and have stiff, thick laminae.

Aster yellows | Squash

DISEASE: Aster yellows

HOST: Squash (Cucurbita sp.)

PATHOGEN: 'Candidatus Phytoplasma asteris'

PATHOGEN SYNONYM: Phytoplasma Aster yellows group

SOURCE: S. Miller

DISEASE: Aster yellows

HOST: Watercress

Diseased watercress (left) and healthy plant (right).

Aster yellows | Watercress

DISEASE: Aster yellows

HOST: Watercress (Nasturtium officinale)

PATHOGEN: 'Candidatus Phytoplasma asteris'

PATHOGEN SYNONYM: Phytoplasma Aster yellows group

SOURCE: W. Borth

DISEASE: Citrus canker

HOST: Citrus (sp. unknown)

Fruit with brown, corky lesions.

Citrus canker | Citrus (sp. unknown)

DISEASE: Citrus canker

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

PATHOGEN: Xanthomonas citri subsp. citri

PATHOGEN SYNONYM: Xanthomonas citri

SOURCE: M. Goto

DISEASE: Citrus canker

HOST: Citrus (sp. unknown)

Leaf with corky lesions. Note absence of halos.

Citrus canker | Citrus (sp. unknown)

DISEASE: Citrus canker

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

PATHOGEN: Xanthomonas citri subsp. citri

PATHOGEN SYNONYM: Xanthomonas citri

SOURCE: M. Goto

DISEASE: Citrus canker

HOST: Citrus (sp. unknown)

Twig with corky lesions.

Citrus canker | Citrus (sp. unknown)

DISEASE: Citrus canker

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

PATHOGEN: Xanthomonas citri subsp. citri

PATHOGEN SYNONYM: Xanthomonas citri

SOURCE: M. Goto