Ever since the beginning of agrarian society man has chosen his most vigorous, tasty, highest yielding plants for planting next years crop.
Plant breeding is genetic engineering and has existed for a very long time.
Confined to transfer between plants that can sexually hybridize. Obvious solution with the advent of recombinant DNA technology is Introducing Cloned Genes into Plants Advantages of Plants for Genetic Engineering Can reproduce asexually and produce large numbers offspring. Genes encoding resistance to chemical pesticides. Genes conferring more natural pesticide resistance. Removing the bacterium does not stop the proliferation of the gall.