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The main dis advantages of plant introduction are:

  1. By plant introduction certain weeds are also introduced like that of the Eichornia crassipes. Such weeds are not present earlier.
  2. Certain insect pests that are causing the Potato tuber are also introduced along with the plant.
  3. Certain plants that are ornamental are now noxious weed. The example is water hyacinth.
  4. The diseases like the Smut of Wheat, Late blight of Potato, Bunchy top of Banana etc. are spread as a result of the plant introduction.
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