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RESULTS

(17)

DISEASE: Bacterial fasciation

HOST: Papaya

Fasciation symptoms of papaya. Causal agent is unknown.

DISEASE: Bacterial wilt

HOST: Alfalfa

Longitudinal section of defined brown gum pockets on inner surface of root bark.

DISEASE: Bacterial wilt

HOST: Alfalfa

Infected plant (left) with typical symptoms of stunting and chlorosis. Other characteristic symptoms are spindly stems and small distorted leaflets. Healthy plant (right).

DISEASE: Bacterial wilt

HOST: Alfalfa

Diseased plant with chlorotic leaves.

DISEASE: Bacterial wilt

HOST: Alfalfa

Cross sections of diseased roots with defined brown gum pockets on inner surface of bark. Healthy root (upper left). Other sections represent increases in disease severity.

DISEASE: Crown gall

HOST: Grape

Grape with multiple galls on trunk resulting from systemic infection.

DISEASE: Crown gall

HOST: Grape

Multiple small galls on trunk of systemically infected grape.

DISEASE: Crown gall

HOST: Grape

Gall on base of 'Zinfandel' grape in California, where aerial galls are less common because of dry, hot weather.

DISEASE: Foamy canker

HOST: Almond

White, macerated tissues near cambium region is characteristic of disease. Foam is usually associated with cankers. The disease is suspected to be bacterial but the causal agent has not been identified.