Bacillary bacteriosis

Bacillary bacteriosis refers to plant diseases caused by bacteria from the Bacillales order. These microorganisms are known for their ability to form endospores, which allow them to remain dormant in the soil for extended periods while awaiting suitable conditions for germination. While many bacilli are soil-beneficial, specific strains act as opportunistic pathogens that compromise plant health.

This disease targets a wide range of crops, including root vegetables, solanaceous plants, and various ornamentals. It is particularly devastating for potatoes, carrots, and onions in storage. The bacteria enter the plant through wounds caused by insects, hail, or mechanical harvesting, eventually colonizing the vascular and parenchymal tissues.

The disease is characterized by soft rot and rapid tissue degradation. As the bacteria secrete enzymes that dissolve cell walls, the affected parts turn into a mushy mass, often emitting a distinct foul odor. Unlike fungal infections, bacterial decay is typically wetter and spreads significantly faster under favorable moisture conditions.

Development and spread are heavily dependent on environmental factors, specifically high humidity and soil moisture. Temperatures between 20°C and 30°C provide an ideal environment for the rapid reproduction of the pathogen. Poor drainage in fields and warm, damp conditions during harvest are the primary contributors to widespread outbreaks and storage losses.

Prevention and control strategies focus on sanitation and environment management. Key practices include:

• Implementing strict crop rotation schedules.
• Ensuring proper soil drainage and aeration.
• Minimizing mechanical injury to plant tissue during cultivation.
• Sanitizing storage facilities and tools to prevent cross-contamination.
• Using biological control agents that compete with pathogenic bacteria.