Unit 3: Pesticide Pollution - Reducing Effects

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  • Reducing Pesticide Pollution
    • Restrictions on use e.g. DDT banned except where malaria mosquitoes are
    • Use of non-persistent pesticides so they don't become concentrated
    • Use of more specific pesticides e.g. pyrethoids
    • Use of systematic pesticides - absorbed by crop and transported in plant sap so aren't leached
      • However can be consumed by humans if still present when crop is eaten
    • Biological control - using predators of pests, barrier crops, sterile-male techniques and crop rotation
    • GM or selectively bred pest resistant crops
      • Can breed with wild varieties and cause mutations
    • Better application techniques - less spray drift by spraying on calm days, even coverage of sprays with smaller droplets


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