RESULTS

(8)

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DISEASE: Bacterial leaf streak and bulb rot

HOST: Onion

The disease is characterized by dark spots on wrapper scales and/or reddish brown discoloration of inner scales.

Bacterial leaf streak and bulb rot | Onion

DISEASE: Bacterial leaf streak and bulb rot

HOST: Onion (Allium cepa)

PATHOGEN: Pseudomonas viridiflava

SOURCE: R. Gitaitis

DISEASE: Bacterial leaf streak and bulb rot

HOST: Onion

Onion with dead and rotted leaf at base of stem. Typical symptoms are water-soaked, dark green lesions that become oval with time, along with streaks and tipburn.

Bacterial leaf streak and bulb rot | Onion

DISEASE: Bacterial leaf streak and bulb rot

HOST: Onion (Allium cepa)

PATHOGEN: Pseudomonas viridiflava

SOURCE: H. Schwartz

DISEASE: Bacterial leaf streak and bulb rot

HOST: Onion

Browning and decay of bulb following inoculation with Pseudomonas viridiflava.

Bacterial leaf streak and bulb rot | Onion

DISEASE: Bacterial leaf streak and bulb rot

HOST: Onion (Allium cepa)

PATHOGEN: Pseudomonas viridiflava

SOURCE: R. Gitaitis

DISEASE: Bacterial leaf streak and bulb rot

HOST: Onion

Close-up of diseased leaves.

Bacterial leaf streak and bulb rot | Onion

DISEASE: Bacterial leaf streak and bulb rot

HOST: Onion (Allium cepa)

PATHOGEN: Pseudomonas viridiflava

SOURCE: R. Gitaitis

DISEASE: Bacterial leaf streak and bulb rot

HOST: Onion

Bulb rot with gray, bluish symptoms. Reddish brown discolorations also may occur.

Bacterial leaf streak and bulb rot | Onion

DISEASE: Bacterial leaf streak and bulb rot

HOST: Onion (Allium cepa)

PATHOGEN: Pseudomonas viridiflava

SOURCE: R. Gitaitis

DISEASE: Carrot yellows

HOST: Carrot

Flowers with shoot proliferation (witches’-broom) (left). Healthy flower (right). Virescence and phyllody of flower parts are common.

Carrot yellows | Carrot

DISEASE: Carrot yellows

HOST: Carrot (Daucus carota)

PATHOGEN: 'Candidatus Phytoplasma asteris'

PATHOGEN SYNONYM: Phytoplasma Aster yellows group

SOURCE: M. Schroth

DISEASE: Carrot yellows

HOST: Carrot

Carrot with proliferation of roots. Initial symptoms include yellowing and narrowing of veins of young leaves. The entire leaf later becomes necrotic.

Carrot yellows | Carrot

DISEASE: Carrot yellows

HOST: Carrot (Daucus carota)

PATHOGEN: 'Candidatus Phytoplasma asteris'

PATHOGEN SYNONYM: Phytoplasma Aster yellows group

SOURCE: G. S. Abawi

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