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RESULTS

(8)

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.

DISEASE: Black chaff (Bacterial leaf streak)

HOST: Wheat

Water-soaked stage of leaf streak.

DISEASE: Black chaff (Bacterial leaf streak)

HOST: Wheat

Interveinal brown streaks and blotches on wheat leaves, a late stage of disease. Symptoms may be confused with other diseases.

DISEASE: Black chaff (Bacterial leaf streak)

HOST: Wheat

Brownish black streaks and blotches on glumes.

DISEASE: Black chaff (Bacterial leaf streak)

HOST: Wheat

Leaves with blighted leaf tips, and blades with brownish red streaks.

DISEASE: Pink disease

HOST: Pineapple

Infected pineapple slices; effect of heating (right) and not heating (left).

DISEASE: Pink disease

HOST: Pineapple

Two clones (A and D) showing different stages of infection. Second and fourth fruits (left to right) have been heated. Disease originally attributed to Gluconobacter oxydans and Enterobacter agglomerans and later to Pantoea citrea.