Burkholderiosis

Burkholderiosis is a destructive bacterial plant disease caused by members of the Burkholderiaceae family, most notably Burkholderia cepacia. These Gram-negative aerobic bacteria are highly versatile, capable of colonizing various environmental niches including plant rhizospheres and vascular tissues.

The disease primarily targets vegetable crops, with onion and garlic being the most susceptible. The pathogens penetrate plant tissues through wounds, natural openings, or necrotic areas, initiating enzymatic degradation of plant cell walls, which leads to tissue disintegration.

The most clinical symptom observed is known as "sour skin" or soft rot. Infected tissues become soft, watery, and eventually collapse, emitting a distinct, pungent, sour odor. On bulbs, the infection often begins at the neck and moves downward, turning the scales into a pulpy, discolored mass.

Environmental conditions play a critical role in the disease cycle. High humidity, heavy rainfall, and temperatures between 20°C and 30°C provide the optimal climate for bacterial colonization and rapid spread. Contaminated soil and irrigation water are the primary vectors for field-to-field transmission.

Managing Burkholderiosis requires a multi-faceted approach centered on prevention. Since there are few effective chemical controls, farmers must focus on crop rotation, planting in well-drained soils, and minimizing mechanical damage during harvest. Strict post-harvest hygiene in storage facilities is vital to prevent the spread of the rot among healthy bulbs.

• Utilizing pathogen-free seeds and sets.
• Implementing effective drainage systems in the field.
• Ensuring thorough curing of bulbs before long-term storage.
• Maintaining cool and dry conditions in produce storage units.