Bacterial vascular rot of beet

Pathogen and disease type: Pectobacterium betavasculorum is a phytopathogenic bacterium that causes vascular necrosis and soft rot in beet crops. This pathogen secretes a complex of cell wall-degrading enzymes, specifically pectinases, which lead to the collapse of tissue integrity and severe maceration of the root tissues.

Crops and economic impact: This pathogen primarily attacks sugar beet, table beet, and fodder beet. The economic losses are significant, as infected roots become unsuitable for processing or storage. In storage facilities, the disease can rapidly spread, resulting in total loss of stored batches and reducing the overall sugar content of the harvested crop.

Symptoms and signs of infection: Initial symptoms include wilting and yellowing of the leaves, which may occur on one side of the plant first. A cross-section of the root reveals discolored, dark-brown or black vascular bundles. As the disease progresses, the central core of the root turns into a foul-smelling, mushy, and water-soaked mass.

Conditions for development: The development of the disease is favored by high soil moisture, poor drainage, and temperatures conducive to bacterial multiplication. The bacterium enters the plant through wounds caused by mechanical damage, cultivation equipment, or soil insects such as nematodes, which serve as primary vectors and portals for infection.

Protection and prevention measures:

• Implementing a strict crop rotation cycle to reduce soil-borne inoculum.
• Managing soil pests that cause wounding to the root system.
• Selecting resistant beet hybrids suitable for local climatic conditions.
• Ensuring optimal irrigation practices to avoid waterlogging the soil.
• Strict sanitation protocols for storage facilities to prevent post-harvest spread.