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RESULTS

(15)

DISEASE: Bacterial blight and bacterial leaf streak

HOST: Rice

Xanthomonas oryzae pv. oryzicola (bacterial leaf streak) causes water-soaked streaks with yellow ooze (left side), and X. oryzae pv. oryzae (bacterial blight) causes brown streaks that have turned white (right side).

DISEASE: Bacterial leaf spot (Blight)

HOST: Poinsettia

Blighted leaves and stems.

DISEASE: Bacterial leaf spot (Blight)

HOST: Poinsettia

Poinsettia with diseased stem. Woody stems may have a yellowed cortex and dark vascular tissues. The stem tip may curve with deformed terminal leaves.

DISEASE: Bacterial leaf spot (Blight)

HOST: Poinsettia

Leaves with small, dark spots, an early stage of disease.

DISEASE: Bacterial leaf streak

HOST: Rice

Severely diseased leaves with light brown streaks.

DISEASE: Bacterial leaf streak

HOST: Rice

Brownish lesions with tiny droplets of bacterial ooze, resulting from artificial inoculation of the pathogen.

DISEASE: Bacterial leaf streak

HOST: Rice

Copious droplets of bacterial ooze on infected leaf margin (right), typical of advanced stage of disease. Healthy part of leaf (left) has clear guttation fluid.

DISEASE: Bois noir disease

HOST: Grape

Severe symptoms of triangular-trapezoid-shaped leaves with desiccated appearance.

DISEASE: Bois noir disease

HOST: Grape

Leaves with disease symptoms identical to flavescence doree, a yellows disease caused by a different phytoplasma. The latter has a slightly different host range and is transmitted by a leafhopper.