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RESULTS

(17)

DISEASE: Bacterial leaf spot (Head rot)

HOST: Lettuce

Leaf with black, greasy spots that tend to be vein delimited. Lesions begin as small, angular, water-soaked lesions that coalesce, resulting in large necrotic areas.

DISEASE: Bacterial leaf spot

HOST: Nephthytis

Leaf with concentric rings of dark tissues. There has been confusion of the causal agent with Dickeya sp., which also causes mushy leaf spots.

DISEASE: Bacterial leaf spot

HOST: Nephthytis

Water-soaked tissues and large, dark brown necrotic areas at leaf margins. Healthy (center leaf).

DISEASE: Corky root

HOST: Lettuce

Corky root causes a reduction in size of lettuce heads and root systems; susceptible cultivar (right) and resistant cultivar (left).

DISEASE: Corky root

HOST: Lettuce

Close-up of root with malformed, corky appearance and longitudinal ridges of brown tissues.

DISEASE: Corky root

HOST: Lettuce

Initial symptoms of disease are yellow lesions on taproot and main laterals. Greenish brown bands occur around roots. Root pith may become brown and hollow.

DISEASE: Corky root

HOST: Lettuce

Differences in corky root symptoms between susceptible cultivar (right) and resistant cultivar (left).

DISEASE: Halo blight

HOST: Bean

Leaves of highly susceptible 'Red Kidney' dry bean with typical water-soaked lesions with halos.

DISEASE: Halo blight

HOST: Bean

'Red Kidney' (dry bean) exhibiting tolerant reaction after inoculation with a halo blight strain. The small, dark lesions dry up in a few days and disease does not progress further.