Bacterial root rot

Bacterial root rot, primarily caused by the phytopathogenic bacterium Pseudomonas radiciperda, is a destructive soil-borne disease. It systematically compromises the root architecture of host plants, leading to severe disruption of water and nutrient uptake, which results in stunted growth, chlorosis, and potential plant mortality.

Chickpeas are among the most susceptible crops to this pathogen. When Pseudomonas radiciperda colonizes the rhizosphere, it can significantly impact yields by reducing plant density and weakening the overall vigor of the crop, making it a critical concern for producers specializing in leguminous crops.

Diagnostic symptoms typically include water-soaked lesions on the roots that eventually turn dark brown or black. As the infection progresses, the root tissues soften and exhibit a characteristic foul odor. Affected plants often display permanent wilting, even under sufficient moisture conditions, as the necrotic root system can no longer sustain the plant's metabolic demands.

The development and dissemination of this disease are strongly influenced by environmental conditions, particularly high soil moisture levels and warm temperatures. The bacterium persists in soil debris and is easily spread through contaminated soil movement, irrigation water, and infected seeds. Mechanical injuries to the root system, often caused by soil-dwelling insects, act as major entry points for the pathogen.

Integrated disease management (IDM) is the most effective approach to mitigate the impact of bacterial root rot. Key preventative strategies include:

• Strict adherence to crop rotation cycles to disrupt the pathogen life cycle.
• Utilization of certified, disease-free, and appropriately treated seed stock.
• Implementation of pest control programs to minimize root wounding.
• Enhancement of soil drainage to prevent conditions favorable for bacterial multiplication.
• Application of specialized seed treatments that provide a protective barrier against soil-borne bacteria during germination.