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: Rugose leaf curl

HOST: Clover

Two rugose, distorted white clover leaves and a healthy leaf. Rugose leaf curl is caused by an unidentified phloem-infecting bacterium.

Rugose leaf curl | Clover

DISEASE: Rugose leaf curl

HOST: Clover (Trifolium repens)

PATHOGEN: Phloem-infecting bacterium

SOURCE: D. Teakle

DISEASE: Strawberry lethal decline

HOST: Strawberry

Diseased plant with bronzing of older leaves and upward rolling or cupping of younger leaves. Leaves are chlorotic on upper surfaces and reddish or purplish on lower surfaces. In time, the entire plant dies.

Strawberry lethal decline | Strawberry

DISEASE: Strawberry lethal decline

HOST: Strawberry (Fragaria × ananassa)

PATHOGEN: 'Candidatus Phytoplasma' sp.

PATHOGEN SYNONYM: Phytoplasma (undefined)

SOURCE: H. Schwartz