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RESULTS

(8)

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.

DISEASE: Bois noir disease

HOST: Grape

Bois noir disease may be expressed on one branch while other branches appear healthy. Note trapezoid-shaped leaves.

DISEASE: Bois noir disease

HOST: Grape

Typical symptoms of triangular-trapezoid-shaped, greenish yellow leaves.

DISEASE: Bois noir disease

HOST: Grape

Berries from infected vines are shrunken and low in sugar and have a high acid content, making them unfit for wine production.

DISEASE: Bois noir disease

HOST: Grape

A typical symptom of disease is uneven lignification of infected branches, resulting in a mix of brown and green patches.

DISEASE: Bois noir disease

HOST: Grape

Infected plant with typical symptoms of rolling, triangular-trapezoid-shaped leaves with desiccated appearance.

DISEASE: Bois noir disease

HOST: Grape

Hyalesthes obsoletus, a cicada, the only defined vector of the phytoplasma causing bois noir disease of grapevines.