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RESULTS

(20)

DISEASE: Apple proliferation

HOST: Apple

Spring form of the adult black-veined psyllid, Cacopsylla melanoneura, a vector of apple proliferation. In winter, adults are more greenish in color.

DISEASE: Apple proliferation

HOST: Apple

Typical apple proliferation symptom of witches'-broom resulting from suppression of apical dominance and growth of dormant axillary buds. Branches are not usually bent down as shown here.

DISEASE: Aster yellows

HOST: Wheat

Healthy head (left) and diseased head (right). Diseased seedlings may die within 2 to 3 weeks. Infected heads of surviving plants are small and sterile, with distorted awns.

DISEASE: Bacterial blast and black pit

HOST: Citrus (Lemon)

The term "black pit" refers to black lesions on fruit, which may be specks or large, sunken pits as seen here. They also may be light tan, later becoming reddish brown to black.

DISEASE: Bacterial leaf blight

HOST: Wheat

Diseased leaves with whitish blotches. Initial water-soaked spots become necrotic and progress from gray-green to tannish white.

DISEASE: Bacterial leaf blight

HOST: Wheat

Diseased leaves with whitish blotches. The disease begins as water-soaked spots and then become necrotic and progresses from gray-green to tannish white.

DISEASE: Bacterial leaf blight

HOST: Wheat

Leaves with reddish tan necrotic lesions.

DISEASE: Bacterial mosaic

HOST: Wheat

Diseased leaves with mosaic pattern exhibiting various amounts of yellowing. Leaves were artificially inoculated by vacuum infiltration.

DISEASE: Black chaff (Bacterial leaf streak)

HOST: Wheat

Water-soaked stage of leaf streak.