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Ladybug love performance at John Heinz Wildlife Refuge at Tinicum. Original public domain image from Wikimedia Commons

CLASS XII – CHAPTER 8 (NOTES 8.5)

MICROBES AS BIOCONTROL AGENTS

  • Microbes in Biocontrol:

    • Biocontrol uses biological methods for plant disease and pest control.
    • Chemical methods (insecticides, pesticides) pose environmental and health risks.
  • Organic Farming Approach:

    • Organic farming prioritizes biodiversity and natural predation.
    • Focuses on maintaining a balance in pest populations within a vibrant ecosystem.
  • Holistic Biocontrol Measures:

    • Aims to reduce reliance on toxic chemicals and pesticides.
    • Understanding interactions between organisms for effective biocontrol.
  • Examples of Biocontrol Agents:

    • Ladybird and Dragonflies control aphids and mosquitoes.
    • Bacteria Bacillus thuringiensis (Bt) introduced for caterpillar control.
  • Genetic Engineering in Biocontrol:

    • Bt toxin genes incorporated into plants for pest resistance (e.g., Bt-cotton).
    • Genetic engineering advancements enhance biocontrol strategies.
  • Fungal Biocontrol Agent:

    • Fungus Trichoderma used for treating plant diseases.
    • Common in root ecosystems, effective against various plant pathogens.
  • Viral Biocontrol Agent:

    • Baculoviruses, especially Nucleopolyhedrovirus, target insects and arthropods.
    • Species-specific with minimal impact on non-target organisms.
  • Integrated Pest Management (IPM):

    • Conserves beneficial insects in overall pest management.
    • Suitable for ecologically sensitive areas.