Quick Diagnosis
Image | Symptoms | possible diseases |
Withering of seedlings and young plants | ||
Small, watersoaked lesions on the pods that expand rapidly. Later lesions are sunken with dark rings |
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Mottled areas of light and dark green areas on the foliage, sometimes yellow spots |
Tobacco Mosaic Virus, Cucumber Mosaic Virus, nutrient deficiency | |
Small yellow and light green spots and mottled areas on the foliage and later on fruits. Ribs remain green. |
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Yellowing of ribs, veins and nerves of foliage and fruits |
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Yellowing and wilting of the leaves, stunted growth without water stress |
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Rust brown spots on the leaves |
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Flour-like, white patina on top of the leaves, rolled-up sprouts |
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Flour-like, white, later yellow patina on the undersides of the leaves and yellowish spots on the top |
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Image | Symptoms | possible pests |
Sticky leaves, damaged leaves and buds, lice in green, yellow, red or black. |
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Fine weaving between the underside and the stems of the leaves, yellow spots on the upper side of the leaves |
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Oval cut-outs at the edge of the leaves |
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Holes in foliage |
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small dark flies, 1-2 mm white larvae in soil |
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Sticky leaves, small white larvae and flies on the undersides of the leaves |
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Leaves have small silvery spots |
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Image sources:
Damping off: Wikipedia, INAKAvillage211
Fusarium: Wikipedia, R.J. Reynolds Tobacco Company Slide Set
Verticillium: Wikipedia, Howard F. Schwartz, Colorado State University, Bugwood.org
Tobacco Mosaic Virus: Wikipedia, Frank Vincentz
Tobacco Etch Virus: R.J. Reynolds Tobacco Company Slide Set, R.J. Reynolds Tobacco Company, Bugwood.org
Potato Virus Y: Wikipedia, R.J. Reynolds Tobacco Company Slide Set
Cucumber Mosaic Virus: R.J. Reynolds Tobacco Company Slide Set, R.J. Reynolds Tobacco Company, Bugwood.org
Thrips: Chazz Hesselein, Alabama Cooperative Extension System, Bugwood.org
all others: Fotolia, Photo credits