Quick Diagnosis

Quick Diagnosis
Image Symptoms possible diseases Withering of seedlings and young plants... more

Quick Diagnosis

ImageSymptomspossible diseases

Withering of seedlings and young plants


Damping-off (different fungi)

Small, watersoaked lesions on the pods that expand rapidly. Later lesions are sunken with dark rings

Anthracnose

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.

Potato Virus Y

Yellowing of ribs, veins and nerves of foliage and fruits

Tobacco Etch Virus

Yellowing and wilting of the leaves, stunted growth without water stress

Verticillium wilt

Rust brown spots on the leaves

Rust fungus / Fusarium wilt

Flour-like, white patina on top of the leaves, rolled-up sprouts

Powdery mildew

Flour-like, white, later yellow patina on the undersides of the leaves and yellowish spots on the top

Downy mildew

ImageSymptomspossible pests

Sticky leaves, damaged leaves and buds, lice in green, yellow, red or black.

Plant louse

Fine weaving between the underside and the stems of the leaves, yellow spots on the upper side of the leaves

Spider mite

Oval cut-outs at the edge of the leaves

Snout beetle, caterpillars

Holes in foliage

Caterpillars

Slugs

Trauermücken

small dark flies, 1-2 mm white larvae in soil

Sciarid flies / fungus gnats

Sticky leaves, small white larvae and flies on the undersides of the leaves

White flies

Leaves have small silvery spots

Thrips


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

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