RESULTS

(10)

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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: Xanthomonas leaf blight

HOST: Onion

This was the first photo of onion leaf blight, which was considered a controversial finding for 10 years until an outbreak occurred in the West Indies.

Xanthomonas leaf blight | Onion

DISEASE: Xanthomonas leaf blight

HOST: Onion (Allium cepa)

PATHOGEN: Xanthomonas axonopodis pv. allii

PATHOGEN SYNONYM: Xanthomonas campestris pv. allii

SOURCE: A. Alvarez

DISEASE: Xanthomonas leaf blight

HOST: Onion

Diseased leaf with necrotic internal tissues.

Xanthomonas leaf blight | Onion

DISEASE: Xanthomonas leaf blight

HOST: Onion (Allium cepa)

PATHOGEN: Xanthomonas axonopodis pv. allii

PATHOGEN SYNONYM: Xanthomonas campestris pv. allii

SOURCE: A. Alvarez

DISEASE: Xanthomonas leaf blight

HOST: Onion

Onions with brown, necrotic, blighted leaves.

Xanthomonas leaf blight | Onion

DISEASE: Xanthomonas leaf blight

HOST: Onion (Allium cepa)

PATHOGEN: Xanthomonas axonopodis pv. allii

PATHOGEN SYNONYM: Xanthomonas campestris pv. allii

SOURCE: H. Schwartz

DISEASE: Xanthomonas leaf blight

HOST: Onion

Onions with severely blighted leaves.

Xanthomonas leaf blight | Onion

DISEASE: Xanthomonas leaf blight

HOST: Onion (Allium cepa)

PATHOGEN: Xanthomonas axonopodis pv. allii

PATHOGEN SYNONYM: Xanthomonas campestris pv. allii

SOURCE: H. Schwartz