RESULTS

(10)

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DISEASE: Syringae leaf spot

HOST: Tomato

Leaves with brown necrotic lesions and chlorotic margins. Symptoms vary greatly among cultivars. Some have black or brown lesions with bright yellow, chlorotic areas and others do not have yellowing.

Syringae leaf spot | Tomato

DISEASE: Syringae leaf spot

HOST: Tomato (Lycopersicon esculentum)

PATHOGEN: Pseudomonas syringae pv. syringae

SOURCE: R. Gitaitis

DISEASE: X-disease (Western X) or buckskin

HOST: Cherry

Comparison of normal, dark cherries (in hand) with infected, immature cherries with less pigmentation.

X-disease (Western X) or buckskin | Cherry

DISEASE: X-disease (Western X) or buckskin

HOST: Cherry (Prunus avium)

PATHOGEN: 'Candidatus Phytoplasma pruni'

PATHOGEN SYNONYM: Phytoplasma X-disease group

SOURCE: A. Purcell, M. Davis

DISEASE: X-disease (Western X) or buckskin

HOST: Cherry

Healthy cherry shoot (left) and stunted shoot (right).

X-disease (Western X) or buckskin | Cherry

DISEASE: X-disease (Western X) or buckskin

HOST: Cherry (Prunus avium)

PATHOGEN: 'Candidatus Phytoplasma pruni'

PATHOGEN SYNONYM: Phytoplasma X-disease group

SOURCE: S. Thomson

DISEASE: X-disease (Western X) or buckskin

HOST: Cherry

Infected trees on 'Mazzard' rootstock (right) may live for years, producing fruit with symptoms. Trees on 'Mahaleb' rootstock (left) usually die rapidly in year of infection, about time of fruit ripening.

X-disease (Western X) or buckskin | Cherry

DISEASE: X-disease (Western X) or buckskin

HOST: Cherry (Prunus avium)

PATHOGEN: 'Candidatus Phytoplasma pruni'

PATHOGEN SYNONYM: Phytoplasma X-disease group

SOURCE: S. Thomson

DISEASE: X-disease (Western X) or buckskin

HOST: Cherry

X-disease causes undersized, yellowish fruit. Diseased branches turn rusty red near end of season. Some defoliation occurs on diseased branches.

X-disease (Western X) or buckskin | Cherry

DISEASE: X-disease (Western X) or buckskin

HOST: Cherry (Prunus cerasus)

PATHOGEN: 'Candidatus Phytoplasma pruni'

PATHOGEN SYNONYM: Phytoplasma X-disease group

SOURCE: A. Jones

DISEASE: X-disease

HOST: Peach

Typical symptoms of diseased tree with yellowing of leaves. Leaves become necrotic and dehisce.

X-disease | Peach

DISEASE: X-disease

HOST: Peach (Prunus persica)

PATHOGEN: 'Candidatus Phytoplasma pruni'

PATHOGEN SYNONYM: Phytoplasma X-disease group

SOURCE: R. Davis, M. Davis

DISEASE: X-disease

HOST: Peach

Late stage of leaf infection. Red-yellow blotches appear after initial water-soaking of leaves. Margins roll upward and leaves appear tattered.

X-disease | Peach

DISEASE: X-disease

HOST: Peach (Prunus persica)

PATHOGEN: 'Candidatus Phytoplasma pruni'

PATHOGEN SYNONYM: Phytoplasma X-disease group

SOURCE: W. Sinclair

DISEASE: X-disease

HOST: Peach

Stunted foliage (left) with some necrosis and small angular fruit. Healthy foliage and fruit (right).

X-disease | Peach

DISEASE: X-disease

HOST: Peach (Prunus persica)

PATHOGEN: 'Candidatus Phytoplasma pruni'

PATHOGEN SYNONYM: Phytoplasma X-disease group

SOURCE: A. Purcell, M. Davis

DISEASE: X-disease

HOST: Peach

Early symptoms are reddish, blotchy areas on cupped leaves.

X-disease | Peach

DISEASE: X-disease

HOST: Peach (Prunus persica)

PATHOGEN: 'Candidatus Phytoplasma pruni'

PATHOGEN SYNONYM: Phytoplasma X-disease group

SOURCE: D. Rosenberger