Wet bacterial rot

Wet bacterial rot, also known as bacterial soft rot, is a destructive disease caused by bacteria from the genera Pectobacterium and Dickeya. This condition affects a wide array of crops, including potatoes, tomatoes, brassicas, and various root vegetables, leading to the rapid decay of plant tissues and significant harvest losses in both the field and storage.

The pathogen utilizes a complex system of enzymes, primarily pectinases, to break down the middle lamella of plant cells. This enzymatic activity causes the host cells to separate and lose structural integrity. The bacteria typically enter the plant through natural openings, harvest wounds, or sites damaged by insects, initiating a process that turns solid plant parts into a foul-smelling, mushy liquid.

Symptomatology involves initial water-soaked spots that rapidly expand into softened, discolored areas. As the infection progresses, the structural tissue collapses, accompanied by a distinct, unpleasant odor. In tuberous and root crops, the interior tissue may liquefy entirely, while the outer skin may temporarily remain intact before rupturing under pressure.

Environmental conditions play a critical role in the development of wet bacterial rot. High humidity and warm temperatures create an ideal environment for rapid bacterial multiplication. Poor ventilation in storage facilities, combined with moisture condensation on the surface of harvested vegetables, creates a perfect breeding ground for the pathogen, often resulting in widespread losses within stored batches.

Protection and preventive measures are essential for successful disease management:

• Implementation of proper crop rotation to reduce soil inoculum.
• Minimizing mechanical damage during cultivation and harvesting.
• Ensuring excellent air circulation and temperature control in storage units.
• Sanitizing harvesting equipment and storage containers.
• Applying certified bactericides or copper-based treatments during the growing season to prevent initial spread.