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RESULTS

(16)

DISEASE: Apple proliferation

HOST: Apple

Spring form of the adult black-veined psyllid, Cacopsylla melanoneura, a vector of apple proliferation. In winter, adults are more greenish in color.

DISEASE: Apple proliferation

HOST: Apple

Typical apple proliferation symptom of witches'-broom resulting from suppression of apical dominance and growth of dormant axillary buds. Branches are not usually bent down as shown here.

DISEASE: Bacterial blight

HOST: Photinia

Symptoms of photinia bud blight shown here are similar to those of blast of pear and apple, caused by Pseudomonas syringae pv. syringae.

DISEASE: Bacterial dieback of nectarine

HOST: Nectarine

Dark cankers on last year's twig. Symptoms of bacterial dieback of nectarine are identical to those of bacterial dieback of peach.

DISEASE: Bacterial dieback of nectarine

HOST: Nectarine

Diseased young twigs.

DISEASE: Bacterial dieback of nectarine

HOST: Nectarine

Bacterial invasion of trunk caused reddish brown discolored area. Symptoms of bacterial dieback of nectarine are identical to those of bacterial dieback of peach.

DISEASE: Bacterial dieback of nectarine

HOST: Nectarine

Discolored vascular tissues and gummosis on infected twig.

DISEASE: Bacterial dieback of nectarine

HOST: Nectarine

Symptoms of the disease include leaf spots (top leaf). Similar appearing leaf spots may be caused by Xanthomonas arboricola pv. pruni (bottom leaf).

DISEASE: Bacterial dieback of nectarine

HOST: Nectarine

Dying tree caused by systemic invasion of the bacterium. Symptoms of bacterial dieback of nectarine are identical to those of bacterial dieback of peach.