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RESULTS

(13)

DISEASE: Aster yellows

HOST: Wheat

Healthy head (left) and diseased head (right). Diseased seedlings may die within 2 to 3 weeks. Infected heads of surviving plants are small and sterile, with distorted awns.

DISEASE: Bacterial fasciation (Leafy gall)

HOST: Begonia

Leafy gall on stem.

DISEASE: Bacterial leaf blight

HOST: Wheat

Diseased leaves with whitish blotches. Initial water-soaked spots become necrotic and progress from gray-green to tannish white.

DISEASE: Bacterial leaf blight

HOST: Wheat

Diseased leaves with whitish blotches. The disease begins as water-soaked spots and then become necrotic and progresses from gray-green to tannish white.

DISEASE: Bacterial leaf blight

HOST: Wheat

Leaves with reddish tan necrotic lesions.

DISEASE: Bacterial leaf spot (Blight)

HOST: Begonia

Initial symptoms appear as small, blisterlike lesions. As lesions age, they enlarge, producing broad patches of necrotic leaf tissue.

DISEASE: Bacterial leaf spot (Blight)

HOST: Begonia

Advanced stage of disease with dark, large necrotic areas on leaves and interveinal chlorosis.

DISEASE: Bacterial mosaic

HOST: Wheat

Diseased leaves with mosaic pattern exhibiting various amounts of yellowing. Leaves were artificially inoculated by vacuum infiltration.

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.