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RESULTS

(15)

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: Bacterial wilt

HOST: Cantaloupe

Cantaloupe field with severe destruction from bacterial wilt (left), less on right.

DISEASE: Bacterial wilt

HOST: Muskmelon

Severely diseased plants as noted by dying runners.

DISEASE: Bacterial wilt

HOST: Muskmelon

Wilt-devastated muskmelon field.

DISEASE: Bacterial wilt

HOST: Squash

Field with severe symptoms of wilt. Foliage often is chlorotic and leaf margins may be chlorotic and necrotic before plant death. Bacterial ooze may be seen streaming from the xylem when infected stems are cut.

DISEASE: Bois noir disease

HOST: Grape

Severe symptoms of triangular-trapezoid-shaped leaves with desiccated appearance.

DISEASE: Bois noir disease

HOST: Grape

Leaves with disease symptoms identical to flavescence doree, a yellows disease caused by a different phytoplasma. The latter has a slightly different host range and is transmitted by a leafhopper.