Pseudomonas for Bacterial Disease Control

  1. Target Pathogens
    Effective against major bacterial plant diseases including bacterial wilt (Ralstonia solanacearum), bacterial leaf spot (Xanthomonas spp.), bacterial canker (Clavibacter), and soft rot (Pectobacterium).

  2. Key Mechanisms of Action

    • Antibiotic production – Produces pyrrolnitrin, pyoluteorin, and 2,4-DAPG that directly kill or inhibit bacterial pathogens.

    • Siderophores – Chelates iron, making it unavailable to pathogenic bacteria.

    • Quorum quenching – Degrades pathogen signaling molecules (acyl-homoserine lactones), disrupting their communication and virulence.

    • Competitive exclusion – Rapidly colonizes plant surfaces (roots, leaves) outcompeting harmful bacteria.

  3. Induced Systemic Resistance (ISR)
    Primed plant immune system responds faster to bacterial attacks via jasmonate/ethylene signaling pathways.

  4. Application Methods

    • Seed treatment (powder or liquid slurry)

    • Soil drench or root dip at transplanting

    • Foliar spray for leaf spot and canker control

    • Drip irrigation for uniform root zone delivery

  5. Compatible Crops
    Tomato, chilli, brinjal, potato, citrus, beans, cotton, and many vegetables/fruits.

  6. Advantages over Chemicals

    • No residue toxicity

    • No resistance development in pathogens

    • Safe for natural enemies, pollinators, and humans

    • Works synergistically with copper fungicides (at reduced doses)

  7. Limitations to Note

    • Requires timely preventive application (not curative for advanced infection)

    • Effectiveness depends on proper formulation and storage (keep cool, avoid sunlight)

    • Less effective under extremely high disease pressure alone – combine with cultural practices.

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