Image Number: 1402049

This soil-borne fungus infects the lower stem of the tobacco plant. Symptoms begin on seedlings and transplants as a dark brown lesion on the stem near or below ground level. Lesions vary in size and number depending on environmental conditions. In wet, cool weather, the lesions may enlarge upward and around the stem until the plant falls over. This may be confused with black shank or Pythium damping-off. On older plants, a dark brown lesion up to several inches long occurs at or near the soil line. It may girdle the stalk which becomes hard and brittle. The stalk may break at this lesion. The plant may be stunted with yellow to brown and/or wilted leaves. Roots usually show no evidence of decay.
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Image location:
United States


Kingdom: Fungi
Phylum: Basidiomycota
Subphylum: Hymenomycotina
Class: Agaricomycetes
Subclass: Agaricomycetidae
Order: Ceratobasidiales
Family: Ceratobasidiaceae
Genus: Rhizoctonia
Subject: Rhizoctonia solani J.G. Kühn


Kingdom: Plantae
Phylum: Magnoliophyta
Class: Magnoliopsida
Subclass: Asteridae
Order: Solanales
Family: Solanaceae
Genus: Nicotiana
Subject: Nicotiana tabacum (flue-cured type) L.
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Image uploaded:
Sunday, March 10, 2002
Image last updated:
Friday, February 18, 2011