RESULTS

(25)

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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: Aster yellows

HOST: Wheat

Healthy head (left) and diseased head (right). Diseased seedlings may die within 2 to 3 weeks. Infected heads of surviving plants are small and sterile, with distorted awns.

Aster yellows | Wheat

DISEASE: Aster yellows

HOST: Wheat (Triticum aestivum)

PATHOGEN: 'Candidatus Phytoplasma asteris'

PATHOGEN SYNONYM: Phytoplasma Aster yellows group

SOURCE: L. N. Chiykowski

DISEASE: Aster yellows

HOST: Zinnia

Yellowing and shoot proliferation of foliage.

Aster yellows | Zinnia

DISEASE: Aster yellows

HOST: Zinnia (Zinnia violacea)

PATHOGEN: 'Candidatus Phytoplasma asteris'

PATHOGEN SYNONYM: Phytoplasma Aster yellows group

SOURCE: J. Forsberg, M. Shurtleff

DISEASE: Bacterial canker (Leaf and fruit spot)

HOST: Kiwi

Diseased blossoms, a stage of bacterial canker.

Bacterial canker (Leaf and fruit spot) | Kiwi

DISEASE: Bacterial canker (Leaf and fruit spot)

HOST: Kiwi (Actinidia chinensis)

PATHOGEN: Pseudomonas syringae pv. actinidiae

SOURCE: J. Young

DISEASE: Bacterial canker (Leaf and fruit spot)

HOST: Kiwi

Leaf spot stage of the disease with small, brown lesions with yellow halos.

Bacterial canker (Leaf and fruit spot) | Kiwi

DISEASE: Bacterial canker (Leaf and fruit spot)

HOST: Kiwi (Actinidia chinensis)

PATHOGEN: Pseudomonas syringae pv. actinidiae

SOURCE: M. Goto

DISEASE: Bacterial canker (Leaf and fruit spot)

HOST: Kiwi

Leaf spots on young leaves. Note dark brown to black lesions on lower surface (left) and similar lesions on upper surface but with yellow halos (right).

Bacterial canker (Leaf and fruit spot) | Kiwi

DISEASE: Bacterial canker (Leaf and fruit spot)

HOST: Kiwi (Actinidia chinensis)

PATHOGEN: Pseudomonas syringae pv. actinidiae

SOURCE: J. Young

DISEASE: Bacterial canker (Leaf and fruit spot)

HOST: Kiwi

Rusty-colored exudate oozing from cankers on infected trunk.

Bacterial canker (Leaf and fruit spot) | Kiwi

DISEASE: Bacterial canker (Leaf and fruit spot)

HOST: Kiwi (Actinidia chinensis)

PATHOGEN: Pseudomonas syringae pv. actinidiae

SOURCE: M. Goto