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RESULTS

(19)

DISEASE: Angular leaf spot

HOST: Tobacco

Leaf with light brown, angular spots. The difference between this disease and wildfire of tobacco is that wildfire is caused by a strain that produces tabtoxin. It causes conspicuous halos around lesions and large parts of a leaf may turn yellow .

DISEASE: Angular leaf spot

HOST: Tobacco

Yellowing of adjacent tissues occur as spots age (midseason). It causes conspicuous halos around lesions. Large parts of a leaf may turn yellow.

DISEASE: Angular leaf spot

HOST: Tobacco

Severely diseased leaf with extensive yellowing.

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 fasciation (Leafy gall)

HOST: Tobacco

Bacterial fasciation of tobacco.

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.