Klebsiella oxytoca

The causative agent of the disease is the Gram-negative bacterium Klebsiella oxytoca, a member of the Enterobacteriaceae family. In agronomy, this pathogen is considered a significant threat, capable of causing soft rot, systemic wilt, and severe tissue necrosis in a wide range of horticultural and agricultural plants.

The host range for this bacterium includes various vegetables, ornamentals, and field crops. It is most commonly identified as a pathogen in onions, cabbage, potatoes, and lettuce. The bacteria often exploit existing wounds or physiological stress, leading to rapid deterioration of plant health both in the field and during post-harvest storage.

Typical symptoms of Klebsiella oxytoca infection include the appearance of water-soaked lesions, softening and maceration of plant tissues, and the presence of a characteristic mucoid exudate. Plants often exhibit chlorosis, stunted growth, and sudden wilting as the vascular system becomes obstructed by bacterial colonization.

The development and spread of the pathogen are facilitated by warm temperatures and high humidity levels. Klebsiella oxytoca thrives in moist environments, spreading through contaminated irrigation water, soil particles, infected plant debris, and mechanical transmission via agricultural tools or insect vectors.

The economic impact of this bacterium is significant, as it can lead to complete crop failure in field conditions and massive post-harvest losses. Effective management requires an integrated approach focusing on sanitation, crop rotation, moisture control in storage facilities, and the use of healthy, certified planting material to minimize the risk of infection.

• Regular disinfection of all agricultural tools and machinery.
• Monitoring and control of insect pests that create entry points for bacteria.
• Maintaining optimal ventilation and temperature control in storage rooms.
• Application of copper-based bactericides as a preventative measure.