Crop protection

    Cards (16)

    • Effect of weeds
      Competition for crop plants, while other pests and diseases damage crop plants all of this decreases productivity
    • Properties of annual weeds
      rapid growth, short lifecycle, high seed output, long-term seed viability
    • Properties of perennial weeds
      Competitive adaptations - storage organs and vegetative reproduction
    • Most of the pests of crop plants are...
      Invertebrates - insects, nematode worms and molluscs
    • How can plant disease be caused?
      fungi, bacteria or viruses, which are often carried by invertebrates
    • Cultural methods of crop protection
      Ploughing, weeding, crop rotation
    • Selective herbicide has a better effect on
      certain plant species e.g broad leaved weeds
    • Systemic herbicide
      spreads through vascular system of plant and prevents regrowth
    • Systemic insecticides, molluscicides and nematicides, spreads through?

      vascular system of plants and kill pests feeding on plants
    • Systemic fungicides

      absorbed by the plant and therefore not washed away by the rain. They only kill fungi that are affecting the crop plant.
    • Applications of fungicide
      based on disease forecasts are often more effective than treating diseased crops
    • Problems with pesticides:
      toxicity to non-target species
      persistence in the environment
      bioaccumulation or biomagnification in food chains
      producing resistant populations of pests.
    • ways to control weeds, other pests and diseases
      biological control + integrated pest management
    • biological control
      the control agent is a natural predator, parasite or pathogen
    • Integrated pest management is....
      combination of chemical, biological and cultural control.
    • Risks with biological control.
      The control organism may become an invasive species, parasitise, prey on or be a pathogen of other species.
    See similar decks