Streptomyces ipomoeae

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Streptomyces ipomoeae symptoms on sweetpotato tubers (click on image to enlarge it)
Author(s): Charles Averre, North Carolina State University
Source: IPM Images
Streptomyces ipomoeae symptoms on sweetpotato tuber (click on image to enlarge it)
Source: Clemson University - USDA Cooperative Extension Slide Series - IPM Images

Streptomyces ipomoeae (Person & Martin) Waksman & Henrici 1940

The bacterium causes Streptomyces soil rot on sweet potato. Infected roots and tubers become necrotic and decay, resulting in stunting, chlorosis and eventually death of the plant. In storage, the tubers can also develop necrotic lesions, reducing their quality.

The disease develops in particular in soil with a pH above 6 and under dry and warm (> 25° C) conditions. It can be managed through the use of resistant cultivars.