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RESULTS

(9)

DISEASE: Aster yellows

HOST: Barley

Infection by this phytoplasm causes twisted awns and sterile florets.

DISEASE: Aster yellows

HOST: Barley

Small necrotic spots on lower leaves and red coalescing streaks on upper leaves.

DISEASE: Bacterial kernel blight (Leaf blight)

HOST: Barley

Dark, brown discolored kernels at the embryo end and posterior surface.

DISEASE: Bacterial leaf blight

HOST: Barley

Diseased barley plants with typical bleaching of flag leaves. Initial symptoms are water-soaked lesions that later coalesce. Eventually, the entire leaf becomes necrotic and edges roll inward.

DISEASE: Bacterial soft rot

HOST: Wasabi (Japanese horseradish)

Longitudinal sections of diseased rhizomes with discolored vascular tissues.

DISEASE: Bacterial soft rot

HOST: Wasabi (Japanese horseradish)

Longitudinal section of rhizome with discolored vascular bundles (left), and rhizome with external symptoms (right).

DISEASE: Bacterial soft rot

HOST: Wasabi (Japanese horseradish)

Cross section of rhizome with dark, infected vascular bundles.

DISEASE: Black chaff (Bacterial leaf streak)

HOST: Barley

Black chaff is characterized by water-soaked and darkened glumes on barley heads and streaks and stripes on leaves.

DISEASE: Black chaff (Bacterial leaf streak)

HOST: Barley

Leaf with linear, water-soaked lesions that turn necrotic and brown. Flakes of dry bacterial exudate are apparent on the lesions. The pathogen also causes black glume of barley.