Plant Diseases

  • Created by: Abc312
  • Created on: 11-05-18 21:55
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  • Plant disease
    • Plant diseases can be detected by:
      • Stuntedgrowth
      • Spots  on leaves
      • Areas of rot
      • Growths
      • Malformed stems or leaves
      • Discolouration
      • The presence of pests
    • Diseases can be identified by:
      • Looking in a gardening manual or website
      • Taking infected plants to a laboratory to identify the pathogen
      • Using testing kits that contain monoclonal antibodies.
    • Plants need mineral ions
      • They get them from the soil
      • A nitrate deficiency causes stunted growth
        • Because nitrate ions are needed for protein synthesis and therefore growth.
      • A magnesium deficiency causes chlorosis
        • This causes yellow leaves
        • Because magnesium  ions are neededto make chlorophyll which is needed for photosynthesis
    • Plant Defence responses
      • Physical
        • Cellulose cell walls
        • Waxy cuticle on the leaves
        • Layers of dead cells around the stems
          • Eg. Bark on trees
        • Physical barriers  stop pathogens entering
      • Chemical
        • Antibacterial chemicals
          • Eg. Mint plant and witch hazel
          • Kill bacteria
        • Poisons to deter herbivores
          • e.g. Tobacco plants and foxgloves.
      • Mechanical
        • Thorns and hairs to deter animals
        • Leaves which droop or curl when touched
          • This knocks insects off and moves them away from things
        • Mimicry to trick animals
          • The passionflower has bright yellow spots which look like butterfly eggs
            • This stops other butterflies laying real eggs there.


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