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RESULTS

(26)

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.

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.

DISEASE: Citrus canker

HOST: Citrus (Orange)

Leaf with leaf miner tunnels and numerous cankerlike lesions.

DISEASE: Citrus canker

HOST: Citrus (Orange)

Upper side of leaves with corky, raised lesions surrounded by yellow halos, a late stage of disease. Such infections usually are visible on lower sides of leaves first and soon after on upper sides.