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RESULTS

(32)

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 blight (Bacterial necrosis)

HOST: Grape

Stem necrosis of grape.

DISEASE: Bacterial blight (Bacterial necrosis)

HOST: Grape

Stem with cankers and discolored external tissues.

DISEASE: Bacterial blight (Bacterial necrosis)

HOST: Grape

Severe infection in vineyard is noted by dead canes. Symptoms are most severe in spring; shoot blight, occasional spots on leaves, and cankers are common.

DISEASE: Bacterial blight (Bacterial necrosis)

HOST: Grape

Leaf with necrotic spots and marginal necrosis. One-sided cracking of petiole tissue is common (not shown here).

DISEASE: Bunch disease (Witches'-broom)

HOST: Butternut

Bunch disease of butternut.

DISEASE: Bunch disease

HOST: Pecan

Pecan exhibiting bunch symptoms at ends of branches. This disease is thought to be caused by a phytoplasma similar to the walnut bunch pathogen in the X-disease group.