Bacterial vascular necrosis and rot

The causative agents of this disease are phytopathogenic bacteria from the Pectobacterium genus. These bacteria are responsible for the severe tissue degradation known as soft rot, as they produce enzymes that dissolve the middle lamella of plant cell walls, leading to the collapse of vascular and parenchymal tissues.

This pathogen has a wide host range, primarily affecting succulents and tuberous crops. Affected species include potatoes, carrots, onions, and various root vegetables. Among field crops, the disease is a significant concern for fodder beet and sugar beet production, where it can cause extensive damage during the growing season and in storage facilities.

Symptoms typically manifest as water-soaked lesions that progress into rapidly spreading soft rot. In beets, the infection often begins at the root crown or damaged areas, showing vascular browning and necrotic spots. As the infection progresses, the internal tissue turns into a foul-smelling, mushy mass, frequently leaving only the outer epidermal layers intact.

Environmental conditions are critical for disease development. High humidity, warm temperatures (20–30°C), and poor soil drainage create the perfect environment for the bacteria to multiply. The pathogen survives in soil, crop debris, and water sources, often invading plants through wounds caused by insects, harvesting equipment, or unfavorable weather conditions like hail.

Prevention and management strategies focus on reducing bacterial survival and preventing infection entry. Integrated pest management (IPM) is essential to minimize wounds that serve as entry points. Crop rotation, avoiding planting in poorly drained soils, and strict sanitation of storage facilities are vital. Harvesting under dry conditions and proper curing of roots significantly reduce the risk of post-harvest rot.