Clavibacter sepedonicus

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Clavibacter sepedonicus - ring rot symptoms on potato tuber (click on image to enlarge it)
Author(s): Neil Gudmestad, North Dakota State University
Source: PaDIL
Clavibacter sepedonicus - wilt symptoms on potato plant (click on image to enlarge it)
Author(s): William M. Brown Jr.
Source: IPM Images

Clavibacter sepedonicus (Spieckermann and Kotthoff 1914) Li et al. 2018 - (potato ring rot)

This bacterium is wide-spread, Gram-positive, non-sporulating and causes potato ring rot. It has quarantine status in some regions. The main symptom is a discoloration of the vascular ring of the tubers which contains bacterial ooze (see illustration on right). Above-ground symptoms include yellow leaf margins which become necrotic. The disease survives inside infected tubers and can be easily transmitted mechanically. Yield losses can exceed 50%.

Synonyms:
Clavibacter michiganensis subsp. sepedonicus

Vernacular names
• Deutsch: Bakterienringfäule der Kartoffel
• English: potato ring rot
• Français: flétrissement de la pomme de terre