RESULTS

(10)

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DISEASE: Bacterial bud and petal blight

HOST: Orchid

Miltonia orchid with brownish necrotic areas around edges of flower petals.

Bacterial bud and petal blight | Orchid

DISEASE: Bacterial bud and petal blight

HOST: Orchid (Miltonia sp.)

PATHOGEN: Acidovorax cattleyae

SOURCE: R. Raabe

DISEASE: Bacterial bud and petal blight

HOST: Orchid

Miltonia orchid with diseased water-soaked flower buds.

Bacterial bud and petal blight | Orchid

DISEASE: Bacterial bud and petal blight

HOST: Orchid (Miltonia sp.)

PATHOGEN: Acidovorax cattleyae

SOURCE: R. Raabe

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

DISEASE: Shallow bark canker

HOST: Walnut

Diseased, discolored tissues revealed by removing external bark.

Shallow bark canker | Walnut

DISEASE: Shallow bark canker

HOST: Walnut (Juglans regia 'Hartley')

PATHOGEN: Brenneria nigrifluens

PATHOGEN SYNONYM: Erwinia nigrifluens

SOURCE: B. Teviotdale

DISEASE: Shallow bark canker

HOST: Walnut

Trunk with brown exudate shallow cankers.

Shallow bark canker | Walnut

DISEASE: Shallow bark canker

HOST: Walnut (Juglans regia 'Hartley')

PATHOGEN: Brenneria nigrifluens

PATHOGEN SYNONYM: Erwinia nigrifluens

SOURCE: B. Teviotdale