Streptomyces scabiei

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Streptomyces scabiei symptoms on potato tuber (click on image to enlarge it)
Source: Wikimedia Commons

Streptomyces scabiei (ex Thaxter 1891) Lambert and Loria, 1989 - (potato scab)

The bacterium causes a widespread and important disease of potatoes which has been also reported from some other root crops. The Gram-positive bacterium is soil-borne and infects the tubers through small wounds, causing corky lesions. The lesions may be superficial, raised or sunken, depending on the potato variety. The disease spreads mechanically or through rain splashes and seed potatoes. Although it is a bacterium, it forms small, branched, fungi-like hyphae and has a large genome. The hyphae also develop chains of cylindrical spores, each about 1 x ½ µm large. Spore-bearing hyphae can have special spiral structures. Hyphae and spores overwinter in the soil. Resistant varieties, disease-free seed potatoes and crop rotation are recommended for control. The disease is not found in soils with a low pH (but see Streptomyces acidiscabies).

Vernacular names
• Deutsch: Kartoffelschorf
• English: potato scab
• Français: gale de la pomme de terre

Synonyms
Streptomyces scabies

For details see the respective page in Wikipedia.