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RESULTS

(15)

DISEASE: Bacterial blight (Boll rot)

HOST: Cotton

Boll rot first appears as raised, water-soaked lesions, which become sunken and turn brown to black with time.

DISEASE: Bacterial blight (Boll rot)

HOST: Cotton

Infection of bolls causes premature opening and increased susceptibility to secondary, saprophytic microorganisms that cause rot. Note discolored cotton.

DISEASE: Bacterial leaf stripe

HOST: Millet

Leaf with long reddish stripes, usually vein delimited.

DISEASE: Bacterial leaf stripe

HOST: Millet

Leaf with reddish stripes delimited by veins.

DISEASE: Bacterial leaf stripe

HOST: Sorghum

Diseased leaf with linear, interveinal stripes that are purplish red. They also can be yellow, tan, or purple depending upon host reaction.

DISEASE: Bacterial leaf stripe

HOST: Sorghum

Leaf with reddish brown stripes between veins.

DISEASE: Bacterial leaf stripe

HOST: Sorghum

Highly susceptible cultivar with severe symptoms.

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.