| Host: |
flue-cured tobacco |
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Nicotiana
tabacum
L.
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| Photographer: |
R.J. Reynolds Tobacco Company Slide Set, United States |
| Contact: |
J. Michael Moore, University of Georgia |
| Descriptor: |
Symptoms |
| Description: |
This fungal disease is encountered in tobacco seed beds and occasionally in the field. Small gray-white, usually circular, spots develop on leaves. As lesions age and dry, they become papery and thin and are surrounded by a raised water-soaked border. Leaf tissues, especially veins and midribs, may appear "pitted" or sunken when viewed from the underside. The lesions become brown. Larger spots may have a dark brown center. Lateral veins on the lower leaf surface may turn dark. Affected leaves may become wrinkled and/or distorted. As the disease continues, the entire leaf may die. Small plants may be killed, resulting in large barren spots in plant beds. In the field, leaf lesions may be followed by cankers on midribs and stems. Anthracnose is favored by wet conditions and is sometimes confused with weather fleck. Symptoms of anthracnose are also similar to those of target spot. Target spot has more consistently circular, pin-head sized lesions which usually do not affect the major leaf veins until the whole leaf begins to die, whereas anthracnose often attacks leaf veins and petioles early in the disease development. |
| Image taken in: |
United States |
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| Image Citation: (?) | | R.J. Reynolds Tobacco Company Slide Set, R.J. Reynolds Tobacco Company, Bugwood.org |
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| Image Use: (?) | |
You must attribute the work in the manner specified (but not in any way that suggests endorsement).
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Available Images Resolutions:
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Image Information last updated on Sunday, March 10, 2002 |
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