RESULTS

(7)

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DISEASE: Deep bark canker

HOST: Walnut

Reddish brown exudate flowing from longitudinal cracks in the trunk. Cankers are deep extending into wood.

Deep bark canker | Walnut

DISEASE: Deep bark canker

HOST: Walnut (Juglans regia 'Hartley')

PATHOGEN: Brenneria rubrifaciens

PATHOGEN SYNONYM: Erwinia rubrifaciens

SOURCE: B. Teviotdale

DISEASE: Deep bark canker

HOST: Walnut

Reddish brown exudate flowing from cracks in trunk, a result of systemic invasion by the bacterium.

Deep bark canker | Walnut

DISEASE: Deep bark canker

HOST: Walnut (Juglans regia 'Hartley')

PATHOGEN: Brenneria rubrifaciens

PATHOGEN SYNONYM: Erwinia rubrifaciens

SOURCE: B. Teviotdale

DISEASE: Deep bark canker

HOST: Walnut

Pits in the wood and black streaks in inner bark are key diagnostic symptoms.

Deep bark canker | Walnut

DISEASE: Deep bark canker

HOST: Walnut (Juglans regia)

PATHOGEN: Brenneria rubrifaciens

PATHOGEN SYNONYM: Erwinia rubrifaciens

SOURCE: N. Schaad, M. Schroth

DISEASE: Deep bark canker

HOST: Walnut

Removal of bark revealed pitted vascular tissues.

Deep bark canker | Walnut

DISEASE: Deep bark canker

HOST: Walnut (Juglans regia 'Hartley')

PATHOGEN: Brenneria rubrifaciens

PATHOGEN SYNONYM: Erwinia rubrifaciens

SOURCE: N. Schaad

DISEASE: Deep bark canker

HOST: Walnut

Dead limbs are characteristic of advanced stage of disease.

Deep bark canker | Walnut

DISEASE: Deep bark canker

HOST: Walnut (Juglans regia 'Hartley')

PATHOGEN: Brenneria rubrifaciens

PATHOGEN SYNONYM: Erwinia rubrifaciens

SOURCE: N. Schaad

DISEASE: Greasy center

HOST: Poinsettia

Stem with dark cankers and copious ooze. Necrotic areas are greasy in appearance and eventually turn light tan to brown with a papery texture as the cuticle becomes detached.

Greasy center | Poinsettia

DISEASE: Greasy center

HOST: Poinsettia (Euphorbia pulcherrima)

PATHOGEN: Pseudomonas viridiflava

SOURCE: R. Raabe

DISEASE: X-disease (Peach yellow leaf roll)

HOST: Peach

Peach twig with yellow, curled (rolled) leaves.

X-disease (Peach yellow leaf roll) | Peach

DISEASE: X-disease (Peach yellow leaf roll)

HOST: Peach (Prunus persica)

PATHOGEN: 'Candidatus Phytoplasma mali'

PATHOGEN SYNONYM: Phytoplasma Apple proliferation group

SOURCE: W. Sinclair