Dickeya undicola

Dickeya undicola is a Gram-negative bacterial pathogen known for causing severe soft rot disease in various plant species. It is a highly aggressive phytopathogen that has become a significant concern in global agriculture due to its ability to cause rapid tissue decay in both the field and storage environments.

The primary host for this pathogen is the potato, though it can affect a range of other tuber and vegetable crops. The bacteria invade plant tissues through lenticels, wounds caused by mechanical harvesting, or damage from pests. Once inside, they secrete cell-wall-degrading enzymes that liquefy the plant's internal structure.

Key symptoms include the rapid wilting of stems and the appearance of water-soaked, dark lesions on the foliage and stalks. In tubers, the infection manifests as a soft, necrotic, and often foul-smelling rot. Under favorable conditions, an entire harvest can be lost within a very short period due to the rapid colonization by the bacteria.

The development of Dickeya undicola is strongly favored by warm temperatures and high moisture levels. The pathogen spreads primarily through contaminated seed tubers, infested soil, irrigation water, and the use of unsterilized harvesting equipment, making strict field hygiene essential for controlling the disease.

Effective management strategy relies heavily on preventative measures rather than curative treatments, as there are no direct chemical controls:

• Sourcing certified pathogen-free seed potatoes.
• Implementing long-term crop rotation to reduce bacterial populations in the soil.
• Sanitizing all equipment and storage facilities after each season.
• Ensuring proper ventilation and moisture control in storage units to inhibit bacterial growth.