Bacterial soft rot

Pathogen and disease type
Bacterial soft rot, caused by the bacterium Pseudomonas marginalis, is a destructive vascular disease affecting a variety of plants. This pathogen is a facultative parasite that colonizes the parenchymatous tissues, breaking down cell walls via enzymatic action, which results in the characteristic disintegration of plant tissue.

Affected crops
The pathogen has an extensive host range, particularly affecting succulent tissues. Crops such as oilseed rape (winter rape) and radish are highly susceptible to this bacterium. Additionally, it causes significant economic losses in potatoes, cruciferous vegetables, and bulbous crops, leading to decay both in the field and during post-harvest storage.

Symptoms and signs of infection
Initial symptoms often appear as small, water-soaked lesions that rapidly expand and darken. As the infection progresses, the tissues turn into a soft, mushy, and foul-smelling mass. In oilseed rape and radish, the rot often begins at the base of the stem or root, causing the plant to wilt, lose vigor, and eventually collapse entirely.

Conditions for development and spread
Pseudomonas marginalis thrives in high-moisture environments with moderate temperatures. The pathogen enters plants through natural openings or wounds caused by pests, cultivation tools, or weather events. The rapid reproduction cycle under high humidity makes it especially dangerous during wet seasons or in poorly drained agricultural fields.

Protection and prevention measures

• Practicing crop rotation by avoiding susceptible crops for several years.
• Implementing rigorous field hygiene and removing infected plant residues.
• Maintaining optimal soil drainage to reduce water-logging.
• Controlling insect vectors that cause the wounds necessary for bacterial entry.
• Using certified, disease-free seed stock and maintaining proper storage conditions for harvested produce.