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RESULTS

(10)

DISEASE: Deep bark canker

HOST: Walnut

Reddish brown exudate flowing from longitudinal cracks in the trunk. Cankers are deep extending into wood.

DISEASE: Deep bark canker

HOST: Walnut

Reddish brown exudate flowing from cracks in trunk, a result of systemic invasion by the bacterium.

DISEASE: Deep bark canker

HOST: Walnut

Pits in the wood and black streaks in inner bark are key diagnostic symptoms.

DISEASE: Deep bark canker

HOST: Walnut

Removal of bark revealed pitted vascular tissues.

DISEASE: Deep bark canker

HOST: Walnut

Dead limbs are characteristic of advanced stage of disease.

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.

DISEASE: Sweet potato little leaf

HOST: Sweet potato

Infected plant (left) and healthy plant (right).

DISEASE: Witches'-broom

HOST: Citrus (Lime)

Lime tree with compact, small leaves (witches'-broom). Leaves on older brooms dry out and eventually drop, leaving dead, bare branches. There are no flowers or fruit on brooms.