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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: Bacterial wilt and dieback

HOST: Willow

Cross sections of the characteristic "watermark stain" of diseased wood. Wilt and dieback occur as disease progresses.

DISEASE: Bacterial wilt and dieback

HOST: Willow

Severely diseased tree with dieback symptoms.

DISEASE: Pseudomonas leaf spot

HOST: Marigold

Marigolds with yellow apical chlorosis attributed to toxin production by the pathogen.

DISEASE: Pseudomonas leaf spot

HOST: Marigold

Chlorotic leaves with total loss of chlorophyll. Disease is also known as toxic chlorosis.

DISEASE: Pseudomonas leaf spot

HOST: Marigold

Plants with bright yellow apical chlorosis.

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.