Phytophthora blight (Phytophthora nicotianae ) on flue-cured tobacco (Nicotiana tabacum (flue-cured type)) - 1402037

Phytophthora blight
Phytophthora nicotianae Breda de Haan

Host: flue-cured tobacco (Nicotiana tabacum (flue-cured type) L.)
Descriptor: Symptoms
Description: The black shank fungus can infect tobacco plants of any age. In young seedlings, stems may decay near the soil surface and the root system may become partly or completely black. A dark lesion may extend up the stem. Symptoms are sometimes confused with damping-off caused by other organisms. The photo above shows black shank damage as it appears in the field. Leaves may suddenly and uniformly wilt or droop, turn yellow, and hang down the stalk. Warm, moist weather conditions favor black shank development. Advanced stages of this disease may cause partial or complete decay of the root system. The black shank fungus is soil-borne and is readily translocated by equipment or water movement to noninfested areas. Since the spores of the fungus are so mobile, distribution of the disease within a field may not be uniform.
Image type: Field
Image location: United States

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: 1402037

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Image Citation:(?) R.J. Reynolds Tobacco Company Slide Set, R.J. Reynolds Tobacco Company, Bugwood.org

Node Affiliation: University of Georgia

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Image uploaded on Sunday, March 10, 2002
Image Information last updated on Tuesday, November 23, 2010