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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

DISEASE: Elm yellows

HOST: Elm

Symptoms of elm yellows occasionally appear on one branch before others, but more often they involve the entire crown.

Elm yellows | Elm

DISEASE: Elm yellows

HOST: Elm (Ulmus americana)

PATHOGEN: 'Candidatus Phytoplasma ulmi'

PATHOGEN SYNONYM: Phytoplasma Elm yellows group

SOURCE: W. Sinclair

DISEASE: Elm yellows

HOST: Elm

Diseased twig (right) with epinasty, chlorosis, and yellowing of leaves. Sometimes both yellow and green leaves occur on same branch. Healthy branch (left).

Elm yellows | Elm

DISEASE: Elm yellows

HOST: Elm (Ulmus americana)

PATHOGEN: 'Candidatus Phytoplasma ulmi'

PATHOGEN SYNONYM: Phytoplasma Elm yellows group

SOURCE: W. Sinclair

DISEASE: Elm yellows

HOST: Elm

Branches with butterscotch discoloration (center) and necrotic flecks in phloem and vascular cambium (right). Healthy branch (left). Sudden wilt and browning is common with small trees.

Elm yellows | Elm

DISEASE: Elm yellows

HOST: Elm (Ulmus americana)

PATHOGEN: 'Candidatus Phytoplasma ulmi'

PATHOGEN SYNONYM: Phytoplasma Elm yellows group

SOURCE: W. Sinclair

DISEASE: Elm yellows

HOST: Elm

Elm yellows is characterized by witches'-brooms and stunting. Some cultivars have both yellow and reddish foliar discoloration.

Elm yellows | Elm

DISEASE: Elm yellows

HOST: Elm (Ulmus parvifolia)

PATHOGEN: 'Candidatus Phytoplasma ulmi'

PATHOGEN SYNONYM: Phytoplasma Elm 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