Causal agent of Ring spot of potato is

A. Pseudomonas fluroscence

B. Ralstonia solancearum

C. Clavibacter michiganensis

D. All of these

Answer: Option C

Solution(By Examveda Team)

The causal agent of Ring spot of potato is Clavibacter michiganensis.
Ring spot causes vascular wilt in the above ground parts of the potato plant, with discolouration and loss of texture/consistency noted in infected tubers.
It leads to Losses of up to 50% of the crop have been noted in severe infections.