Soft rot of potato (Pectobacterium polonicum)

Pectobacterium polonicum is a pathogenic bacterium classified as a causal agent of soft rot in various plant species. This pathogen belongs to the Pectobacterium genus and is recognized for its ability to rapidly degrade plant tissues by secreting a complex of cell-wall-degrading enzymes, primarily pectinases.

Potatoes (Solanum tuberosum) are the primary agricultural crop affected by this pathogen. The bacteria can persist in soil, crop residues, and infected tubers, creating a continuous cycle of infection that poses a significant threat to global potato production systems and storage facilities.

Symptoms of the disease are characterized by the liquefaction of infected tissues. Initially, small water-soaked lesions appear on the surface of the tubers or stems, which quickly expand and turn into a soft, mushy, and foul-smelling mass. In advanced stages, the internal structure of the plant part is completely destroyed.

The development and spread of Pectobacterium polonicum are highly dependent on climatic conditions. Excessive soil moisture, anaerobic conditions due to waterlogging, and moderate to high temperatures significantly accelerate the proliferation of the bacteria and the infection process in host plants.

Effective management strategies rely on integrated pest management practices. Key actions include selecting certified disease-free seeds, ensuring proper drainage in fields to prevent waterlogging, and maintaining hygienic conditions in warehouses. Gentle handling of tubers during harvest is essential to minimize wounds that serve as entry points for the bacteria.