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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 heart rot

HOST: Palm

Palm with advanced stage of heart rot. Symptoms of mature palms include rapid browning and desiccation of foliage, rot of roots and buds, and aborted fruits.

DISEASE: Sudden death (Wilt)

HOST: Palm

Palm in Columbia with severe yellowing of leaves.

DISEASE: Sudden death (Wilt)

HOST: Palm

Palm with desiccated, wilted leaves, a symptom of the disease.

DISEASE: Sweet potato scab

HOST: Sweet potato

Tubers with large, dark scabs.

DISEASE: Sweet potato scab

HOST: Sweet potato

Black and necrotic decay of fibrous roots.

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.