Image Number: 1402051

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:

You must attribute the work in the manner specified (but not in any way that suggests endorsement).

Image location:
United States


Kingdom: Fungi
Phylum: Ascomycota
Subphylum: Pezizomycotina
Class: Sordariomycetes
Subclass: Hypocreomycetidae
Order: Microascales
Family: Ceratocystidaceae
Genus: Thielaviopsis
Subject: Thielaviopsis basicola (Berk. & Broome) Ferraris


Kingdom: Plantae
Phylum: Magnoliophyta
Class: Magnoliopsida
Subclass: Asteridae
Order: Solanales
Family: Solanaceae
Genus: Nicotiana
Subject: Nicotiana tabacum (flue-cured type) L.
Node Affiliation:
Image uploaded:
Sunday, March 10, 2002
Image last updated:
Tuesday, January 25, 2011