black root rot (Thielaviopsis basicola ) on flue-cured tobacco (Nicotiana tabacum (flue-cured type)) - 1402051

black root rot
Thielaviopsis basicola (Berk. & Broome) Ferraris

Host: flue-cured tobacco (Nicotiana tabacum (flue-cured type) L.)
Descriptor: Symptoms
Description: This fungal disease is associated with high soil pH. In the plant bed, irregular areas of seedlings turn pale green to yellow. Roots may be severely blackened, rotted or pruned, or they may have only a few lesions near the tap root. Damping-off can occur if the rot extends up the stem. In the field, infected plants in circular areas turn pale, are stunted, and flower prematurely. They wilt in the heat of the day but recover at night. Small roots may be rotted at the tips; larger ones have rough sunken black lesions along their length. Root pruning is common. If the weather turns warm before rot becomes extensive, new roots will form and plants will recover. Symptoms may be confused with those due to drowning, lesion nematode, or black shank.
Image type: Field
Image location: United States

Specimen Information

Specimen in collection: No
Specimen Condition:
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Photographer Information

Name: R.J. Reynolds Tobacco Company Slide Set
Organization: R.J. Reynolds Tobacco Company
Country: United States

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Image Number: 1402051

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Image uploaded on Sunday, March 10, 2002
Image Information last updated on Tuesday, January 25, 2011