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RESULTS

(13)

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.

DISEASE: Foamy canker

HOST: Almond

White, macerated tissues near cambium region is characteristic of disease. Foam is usually associated with cankers. The disease is suspected to be bacterial but the causal agent has not been identified.