Burkholderia gladioli

Systematic position and pathogen type: Burkholderia gladioli is a gram-negative, motile rod-shaped bacterium within the Burkholderia genus. As a serious phytopathogen, it is known for its wide host range and ability to persist in diverse environments, posing a threat to both ornamental crops and agricultural production.

Diseases and host plants: This bacterium is widely recognized as the causative agent of bacterial rot in gladiolus corms, but it also impacts other bulbous plants such as onions and irises, as well as orchids and various field crops. The infection typically results in internal rot, tissue softening, and necrotic lesions, which can lead to the total destruction of the infected organs.

Biology and life cycle: The pathogen is primarily soil-borne and can remain viable in crop debris for extended periods. It enters host tissues through wounds caused by insects, harvesting equipment, or environmental stresses. Once inside, the bacteria utilize hydrolytic enzymes to degrade cell walls, facilitating rapid colonization and systemic spread throughout the host tissue under favorable conditions.

Developmental conditions and impact: Disease development is highly dependent on environmental factors, particularly high humidity and temperatures between 25°C and 30°C. The economic impact of Burkholderia gladioli is significant, as it leads to high post-harvest losses, diminished market quality, and reduced vitality of propagative material, making it a critical concern for commercial nurseries and farmers.

Control and management measures: Managing Burkholderia gladioli requires a robust integrated strategy, as chemical eradication after infection is often not feasible. Recommended practices include:

• Strict sanitation protocols for handling and storing bulbous crops.
• Careful inspection and culling of symptomatic planting material before propagation.
• Crop rotation to reduce the pathogen population density in the soil.
• Proper ventilation and climate control in storage facilities to limit moisture accumulation.
• Application of biological control agents and localized bactericides as a preventive measure in high-risk environments.