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RESULTS

(16)

DISEASE: Bacterial blight

HOST: Tulip

The disease causes white veins of leaves, yellow vascular bundles, and yellow bacterial slime on bulbs.

DISEASE: Bacterial blight

HOST: Tulip

Stunted plants with wrinkled leaves.

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: Pothos

Leaf with black necrotic tissues with concentric rings of light and dark tissues.

DISEASE: Bacterial wilt

HOST: Pothos

Pothos with infected stem and petioles.

DISEASE: Bacterial wilt

HOST: Pothos

Plant with severely infected leaves and stems.

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.