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RESULTS

(11)

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: Goss's bacterial wilt and blight

HOST: Corn (Maize)

Wilted, dying plants. Leaves have gray to light yellow stripes and irregular margins that follow leaf veins. Systemically infected plants usually have orange vascular bundles.

DISEASE: Goss's bacterial wilt and blight

HOST: Corn (Maize)

The disease causes necrotic leaf lesions, which typically have dark flecks (freckles) within the lesions (not seen here).

DISEASE: Hairy root

HOST: Rose

Hairy root symptoms of many fibrous roots (right). Noninfected root (left).

DISEASE: Hairy root

HOST: Apple

Crown gall (left) and hairy root (right) caused by Agrobacterium tumefaciens and A. rhizogenes, respectively.

DISEASE: Hairy root

HOST: Rose

Crown gall (left) and hairy root (right) caused by Agrobacterium tumefaciens and A. rhizogenes, respectively. Healthy root (center).

DISEASE: Wildfire (Angular leaf spot)

HOST: Tobacco

Characteristic symptoms are necrotic, brown spots with angular margins surrounded by distinct yellow halos. The halos are caused by the production of tabtoxin.